>Gen I
Who's playing: Genwunners
Hated by a lot of glitches, bugs and very annoying fans.

>Gen Il
Who's playing: Johto damn, I forgot
Practically, hated for the same reasons as first gen.

>Gen Ill
Who's playing: Hoennbabies
Hated by a lot of water routes which are inhabited by wingulls and tentacools. Also, trumpets and HOENN CONFIRMED!!!.

>Gen IV
Who's playing: Sinnohfetuses
Hated by a total design of all pokemon.

>Gen V
Who's playing: Unovaspermos
VERY hated by starters and inanimated pokemon.

>Gen Vl
Who's playing: Nobody yet
At the present time, it's very hyped, but there were several people who reproached some pokemon as newtwo and honedge.

So, there is never be a generation that all pokefans will love? Anyway, what yours favourite and least favorite generations?