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Kanto: Squirtle and Charmander are great, Bulbasaur is maybe sort of alright, kind of an acquired taste.
Johto: Same story except Chikorita is just terrible.
Hoenn: All three of these are good in some way.
Sinnoh: I wouldn't call any of them terrible but Chimchar's line comes pretty close.
Unova: Jesus Christ, get the fuck out of here. Game with the most inclusive amount of features and creative storytelling also happens to have the worst new Pokemon imaginable.
Kalos: Sort of another Hoenn situation but all of them are a little less individually good. I'd say all of them are kind of acquired tastes except Greninja. Who for some is kind of an "acquired hate".