Hakuouki: Demon of the Fleeting Blossom on the PSP is the only otome I played (well, the only one I would ever consider recommending). Never finished it but I enjoyed my time with it due to the affection system that very clearly tells you who wants to stick their sword in ya ( ?° ?? ?°) and the surprising amount of action featured in the story (what can I say, I'm a sucker for hell knight tropes).
Also really enjoyed the artwork, the thing I usually don't like about otome games (although I recall LOTS of muscle everywhere, but I might be imagining that). Only major gripe I have with it is the protagonist, but you eventually learn to accept that the PC being vulnerable allows the other characters to take center more often (which is good, cause I can't remember a single trait pertaining to her (the PC) and would much rather spend my time with actual characters).
If anyone can recommend any otome games with a strong PC, I'd be grateful.
Hell, if anyone can recommend me another PSP VN that would also be great. I'm finding a distinct lack of VNs in the PSP's corner.