Why I don't like 4th gen of Pokemon

So a little background info:
Pokemon Black & White 2 are coming out a day after my birthday. And thinking about maybe getting it made me decide to look back at my older games. And for those who don't know when I say Gen x of Pokemon, here's a quick guide:
Gen 1: Red, blue, and Yellow
Gen 2: Gold, Silver, and Crystal
Gen 3: Fire Red, Leaf Green, Ruby, Sapphire, and Emerald.
Gen 4: Diamond, Pearl, and Platinum
Gen 4.5: Heart Gold and Soul Silver
Gen 5:  Black and White
And I don't know where Black & White 2 will go until I play it.
Anyways first I want to explain why I didn't put HG and SS with D,P &P. The main thing I have is that the two feel very different where as Ruby and Fire Red don't seem like they were made by two different people. I honestly don't know about Platinum, but feel free to correct me on if that should be more with 4.5

I had a few problems that were unique to these games.
Most ridiculous villain

They looked silly then, they look silly now. Some people say that they have one of the more legitimate "save the world plots" but it's hard to take them seriously when you're lolling at hair or outfits. That and they still have a storm trooper-like syndrome. In that they can't be threatening in any sense after fighting them.
Learning curve
It switches from really easy battling to hard bosses at a whim. And I know that bosses are supposed to be harder than the trainers in the gym or during the bad guy plot. But lvl 9, lvl 9, lvl 14, lvl 16, the last two being boss ones. That's not fair. 2-3 level jumps are expected, not 5 levels.
New Pokemon
We have:

The cat that has ugly in it's name to make it even more apparent how ugly and annoying this is.

And the affermative action Gardevoir. Because we really needed that, but yet Lopunny, the new one, only has one form for gender. 

First time playing Diamond, I had a boy one.

Honestly a lot of the Pokemon this Gen were relatively forgettable. There were very few that I was excited about 2nd time playing around and showing me the occasional gen 1-3 Pokemon taunted me with the better Pokemon. The first catch-able non-gen 4 Pokemon? Psyduck. Which is redundant since I have Piplup.

All in all, it's not bad, it's not like they betrayed their old ways, but it's just not my favorite game to date.