This review is from a biased point of view of a 23 year old.
Having watched Futakoi Alternative I was expecting much much more from this show. It's a typical anime series that has another weak male lead leading many girls on that they could be his love interest. It's the same formula you'll see in 20 other shows under the same genre and it gives nothing new at all.
What it gives is simply incredibly cute and perfect girls who each have a twin who are all madly in love for lame reasons. All in by itself, this is not worth watching as an anime show. But durring the series they showed some actual psychology and differences between the twins. But, sadly, this was kept purely for 2 sets of twins and pretty much every other set of twins were replicas of themselves.
Ignoring the generic story and the cheap old school animation and take a look at the characters themselves, I've come to the understanding that amazing girls equal a watchable show. If you agree with this then you'll find yourself enjoying this show and will want to periodically kill the main lead over and over... and over.
This show does not receive any recommendations from me, but it's a decent enough watch if you want to feel terrible for girls falling for a loser, also, the ending is incredibly unsatisfying.