>>325658841st Generation: Surprisingly I like all 3 starters despite the fact that I unironically dislike most everything else about this generation. No complaints really.
2nd Generation: Literally almost the exact opposite opinions as of 1st gen, I love the 2nd generation but all three starters are shit, I like Cyndaquil but man its line is literally the worst case in the entire franchise of "it just gets bigger".
3rd Generation: This generation's starters are almost perfect, my favorite Pokemon is Sceptile, and both the Treecko and Mudkip lines are all A+. However, I just dislike Torchic and Combusken. I like Blaziken but the first two stages just look weird, almost awkward to me and it's hard to explain why.
4th Generation: I really don't like any of the middle stages of any of these starters. I am a fan of all the first and final stages (my least favorite would have to be Chimchar of these but I don't hugely dislike it), but all the middle stages feel like "okay we designed these two, now we gotta design something between them", the worst of them being Grotle.
5th Generation: I actually like almost all the starters here, except two - Servine and Dewott.The main reason I dislike these two is that Servine is again "it just gets bigger", and Dewott suffers a problem similar to Sinnoh's problem, but fortunately the other two starter families don't share the same fate.
6th Generation: Basically I love all three stages of Chespin and Froakie, but I really hate all three stages of Fennekin. Okay I kinda like Braixen, it's cute in Pokken and all. But mainly I dislike how they had to make one starter line "the one for girls". It just demonstrates an out-of-touch-ness on GF's part in my opinion.
7th Generation: Literally just copy & paste the 6th Generation opinions but with 7th Generation starters, obviously with the Popplio line taking Fennekin's spot.
Overall, 3rd > 1st > 6th > 5th > 4th > 7th > 2nd.
sorry for the rambling