Well, as long as we're rating gens:
Gen 1 was ok. Personally I found most of it to be rather bland imo, but I'd be lying if I said it wasn't super nostalgic.
Gen 2 I really liked. There are a few designs that I didn't care for, but overall I found it to be quite good.
Gen 3 was definitely in my top 3. Although I have much less favorite pokemon from it, it really hits a nostalgic spot for me, just with the overall region, design, story and music (especially music <3).
Gen 4 was actually my favorite, although that's probably to be expected from the gen that I first started playing the games. I loved almost all of the designs and have the entire region memorized by heart. Probably because it's the one that I played the most and have the most memories of, but I can't get over how much I love it (not to mention, at least 75% of my favorite pokemon are from it).
Gen 5 I really didn't like. Maybe because Gen 4 was where I started, and it was the first time I had to deal with new pokemon and gameplay mechanics, but the whole thing just overwhelmed me. The games overall followed a different formula. There were pretty much no pokemon from previous gens in BW1, so I felt like I was playing an entirely different series. Also, I REALLY didn't like how the battles looked; everything used a lower quality sprite from last gen that was turned into a gif, and the quality loss really showed when the battle scenes kept zooming in and out. Again, I probably hated all of these because of the feeling of being alienated, but it doesn't change that I just don't have any particularly good memories from it.
(Also, the endgame in BW1 was pretty much nonexistent; it was one city with nothing important, another city that was even less important, a town built on a bridge that actually had really good music (tbh, I really loved village bridge), and a huuuuge city that was literally empty. Absolutely nothing other than a pokemon center and a tiny building in the corner that I couldn't even enter. After some research I found out that it was empty because I took my time to beat the game (which REALLY irks me)).
Gen 6 looks really promising. Only complaint I can find is that I don't like the look of the 3D overworld.
I can say the same for the games in general. Platinum is my favorite so far. Then it goes to the Gen 2 remakes, followed by Emerald, then Yellow, BW, then BW2 (Which I still haven't finnished). I'm mostly counting third games just because consistantly, I prefer them over the 2 originals of the gen.
