So, why does /vp/ hate gen 4 so much?
>main games
I loved d/p/pt honestly. The only problem was how slow they were.
>region
I think Sinnoh is the poster child for a well designed region. The region is quite large, which is something I find nice. Also, it's not very linear, like Unova. Another thing was that Sinnoh had a great postgame. We got a battle frontier and stark mountain ect:
>story
Hands down, my favourite plot. Cyrus wants to fuck shit up, That's all he wants to do. Destroy the entire fucking universe. Also, it's really cool how in platinum you get taken to the distortion world.
>pokemon
I will admit, my least favourite Pokemon of all time ever is a gen 4 pokemon, but it's made up for by some awesome 10/10 designs like: >Gallade
>Gliscor
>Rotom
>Torterra
>Lucario
>Weavile
>Garchomp
>Staraptor
>Drapion
>Roserade
>Creation trio
>Darkrai
>Toxicroak
and there are heaps of other ones

tl:dr: Gen 4 was pretty a-okay