I have to say, about Bakarina, that it's awesome just for existing.
The bi-harem thing can be looked at as a gimmick, but on a deeper level, it shows where we are now as a society, where Japan is now, and how we've crossed into new territory. Shows like BakaTest made jokes in that direction, but Hideyoshi was attractive because he was feminine. Bakarina is a silly light harem in form, but the fact that it so nonchalantly does what it does is what is great. The characters all having a crush on Caterina isn't some serious thing or a secret, it's just a sort of trivial fact of the series.
When same-sex love is something that either exists as serious business for a token character, or when it's part of a world where men don't exist, it's one thing, but when it's trivially normal, that's cool. Especially when it's not played off as friendship, the series is an unabashed harem and just goes all out in that direction.