Oh boy. I don't know about you guys, but this gen, one of the smallest, felt like it lasted forever.
Now, I've made it no secret that Sinnoh is my least favorite generation, but I think you'll agree I've been more than fair with my assessments.
It averaged out to a 4.9/10, which I even think seems a little high. I felt like I was handing out 1's like the ice cream man hands out fudge bars to kids in the Sahara desert. Between the birds, rodents, bugs, and fish, there were a lot of absolute stinkers. Well, compared to the 1st Gen (6.2), the 2nd Gen (5.8), and the 3rd Gen (6.1), 4.9 is significantly lower.
See, the recurring complaint I have with this gen is "pointless". Pointless new rodents and birds. Pointless gimmicks on awful Pokemon. Pointless hoops, dots, and bands on otherwise solid designs. Pointless amount of legendaries. Pointless baby forms of Pokemon that no one asked for.
And you know what? Out of 107 new Pokemon, 28 relied on previous Gens to evolve into or from. That means this is arguably the most natural expansion, but on the other hand
holy shit only 3/4 of the Pokemon were actually "new". This is when people say Pokemon ran out of ideas, because 25% of the time all they could think of was to rehash an existing design. And sometimes (Roserade, Weavile, etc) it worked. But mainly (Happiny, Magmortar, Dusknoir) they absolutely did not. It was as if they forgot the original Pokemon's idea, which makes me wonder why they even bothered making it an evolution if they clearly wanted to go this different direction with it.
But I do appreciate the advances in gameplay that Pearl, Diamond, and Plantinum brought. The Physical/Special split especially. Now, a Water Pokemon with high Attack can still be viable, because Water Tail and Waterfall are Physical attacks, instead of being classified as Special along with every other water move. Adding more 3D models was neat, as was the gender differences, which help make every single Pokemon just a little more unique. Team Galactic was kinda goofy, though.
So while the 4th Gen definitely had some highlights, and advanced the gameplay, for me I've always thought of it as the weakest by far.