Woah, woah, woah; hold on... You hate this Gen a lot and we should respect your opinion, but there are some things to start with:
1) The 4th Gen Pokemon are the most rush and uncreative
I must admit that many Sinnoh's were weird-looking... Prinplup, Probopass, Lickylicky, Tangrowth... but there are some awesome ones: Gallade, Manaphy, Arceus, Chingling, Munchlax, Riolu, Lucario, Piplup, etc.
2) The Physical-Special split
You aren't a competitive battler, are you?
3) The story line with Team Galactic and such was too over the top
You're 100% right on this one. Well, sorta. Because Every. F******. Villian. from Pokémon games sucks. Team Rocket? Money. Magma and Aqua? Biological Terrorists. Actually, those are the only acceptable villians... Team Galactic? Weirdos. Sucked... the only true "villian" I've seen on the whole Pokémon series is Molly. Do you remember her, from Pokémon 3 (The Unown Movie)?
Ambition is Rocket's, Magma's, Aqua's and Galactic's motivation. Molly's unique, she doesn't want money nor a new world or the like. She is motivated by anger, sadness, frustration. Now that's what I call a bad guy (girl in this case). I'd love to see a bad guy/girl like her on 5th gen. But oh well... at least that's a good idea to put in my future hack xD.
4) The Gym Leaders and E4 were way too easy
As almost every person on this thread has said; it depends on whenever you train or not.
5) The Sinnoh region doesn't have many Water routes
This is personal tastes, I hated water routes. I was glad they're gone now.
Also, I don't remember who, but someone said on this topic that "every generation has it's own faults" . Now that and the Molly thing are the best things ever said in this topic. Period.