Four
I'd argue that with horrid spelling and grammar you won't be getting above a 2. You can have the best story ever but if it is a pain to read, it won't be well received. Granted, those who trudge through will probably encourage you to fix it up.
Heck, I'd say general readability is important, if people can't understand what you are trying to express with your writing, they won't end up engaged with the story. Don't do stupid things with font style & size. Generally follow conventions. Proofread!
Granted, some mistakes can and do get forgiven, but you cannot have a story riddled with mistakes, it won't end well. With that said, for the minimum at the start, you just ought to read over what you write at least once to see if it makes sense and can be read. People aren't expecting perfection, but they do expect some effort to be put into published stories.
Six
Personally, I'd say that the fundamental aspect isn't getting readers invested in characters, but rather engaged with the story. I feel this is broader and can thus better cover stories where characters are not the central focus. Granted, most readers do really like well written characters, and character driven stories seem to be the norm and most widely accepted, but I feel you shouldn't discount stories trying to do things in a different style.
Anyway, having characters who feel realistic makes sense as a criteria, tho less logical works can still work (but they can be harder to pull off). I'd, again, argue it is more about making the characters engaging than realistic, since it is a broader goal, but I'm more OK with this statement of yours than the other one. Maybe simplify it down to being consistent with the things the story establishes? I feel the word realistic can make it sound like certain things wouldn't work, but having a strange story which has consistent internal rules should still work even if it is not something realistic. Maybe I should just say, there needs to be some method to the madness, if you go that route.
Seven
I'd say no, as I do not think every story will benefit from love interests. Obviously, in CYOAs they can do what you have mentioned, and it can lead to some interesting things due to the potential different paths provide. BUT I disagree with it being one of the most important characteristics of a 7, but maybe I'm just delusional.
Personally, I'd say think about what you can do to help elevate the specific story. Love interests might be just that, but maybe utilizing themes more effectively would be the better choice. Perhaps working on the flow on both the micro and macro scale would be a good idea instead. Thinking about narrative beats and grander concept things too!
Obviously, you can still just write something to be cool/fun, and it can definitely work, especially considering CYOA's unique strengths and weaknesses (such as foreshadowing being much trickier to do well when the reader can end up in different spots). However, I think it is at least worth considering these other things to figure out what you prefer most, maybe you don't care for themes and think they belong in eight grade books, but maybe you just haven't thought about it and now want to include it, who knows!
There is a lot of freedom in writing, and I'd say it is all about finding what works for you, but that doesn't mean you cannot gleam something useful from others. You aren't inventing the concept of stories here, trying to get something useful from what others think can be invaluable in helping you make your writing better.
Oh, I'll quickly add here that there is a thing such as too much detail, and in certain scenarios less can really be more. With that said, most stories that suck tend to have too little detail/information, so trying to have more can be a good first step. You can always trim things down. Granted, you can have 'bloated' paragraphs and still have a good story, but you want to be careful that it still flows and has good pacing (tho that would arguably mean the paragraphs are no longer 'bloated', just long).
Eights
I like to think that 8's don't have to be perfect, rather just really good at what they do. I'd also argue that you can have a short 8, since length isn't everything, but it can definitely be harder as you'll really need to utilize the word space you have to maximum effect if you want the story to resonate as much with readers as something longer (as the longer a story, the more time for the reader to explore/engage with it).
Conclusion
Yeah idk, I didn't like how authoritative some of the things here were so figured I'd add my own thoughts. Truth is tho, I might just not have enough conviction, so what I added might be too general (or I might not have spotted stupid things among my thoughts). The post is still good, very informative with good use of examples.
I'd say if you have to ask if something is worthy of being an article, it probably isn't. Tho I'm not an article expert so don't mind me. Maybe see if the post gets commended? That might show it contains enough value that turning it into an article might be a good idea.
As for the OP's question, almost any idea can work, you are being way too vague for us to figure out if the idea will fail. The execution tends to matter more in these scenarios where the idea is relatively vague. However you should probably try to write, worst case scenario you improve and learn, best case scenario, you write something that you want to write AND improve and learn. Both are good outcomes, so just write!
TL;DR
Austinc - I micro-aggressively opine that you are being overtly restrictive:
- Readability is paramount, so grammar/spelling are more important (proofreading is a good tool here),
- I think engagement is more fundamental than investment, as investment leads to engagement,
- Love interests are not needed for all stories, or in other words, you can have a really good story without love interests.
Evie22 - Almost any idea can work, so go ahead and write it! Remember to proofread so that readers get the best experience possible.