There's a thing i always said about pokémon :

"Every gen have flaws, yet every gen is awesome."

Gen1 : Flaws : SO MUCH GLITCHES. Good side : Started the idea of pokemon, and was super imaginative when it came out
Gen2 : Flaws : Kinda glitchy. Lookalike of the Gen1. Good side : COLOR. The new pokemons, and a few new gameplay elements
Gen3 : Flaws : Way too much water, too much HMs, and zigzagoons are ruining muh nuzlockes. Good side : Actual differences between versions, awesome new pokemons, NEW TYPES, and awesome music.
Gen 4 : Flaws : Some pokemons are… a tad weird. Good side : Big story, EMPOLEON, awesome champion, actually quite challenging.
Gen 5 : Flaws : Some mons just want to make me shout "THE FUCK ?", the story is hard to follow if you don't buy BW and then BW2. Good side : The. Fuckin'. Story… Some pokemon are awesome, TM are re-usable and lilligant is mah waifu.
Gen 6 : Flaws : You'll know who's the bad guy just by looking at him. The new type is kinda OP. Good side : Mega evolution is awesome, the villain came THAT CLOSE to destroying the world, and quite difficult without the xp share. AND YOUR POKEMONS ARE IN FULL 3D, NOT JUST SPRITES.

Also comes in Nintendo 64 entry for anything, NES titles and PC-98 Touhou varieties!