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BW's beginning part does suck ass and it always has. It's attempting to introduce you to the "all new Pokemon" gimmick slowly by only having a few early on, then having more and more become available as the adventure continues. It's at least understandable but it's still shitty. Anytime I replay BW, I always dread up to Gym 1 since it's such a boring samey expeience.
BW2 fixes all of these issues by having more Pokemon, a bunch of more interesting areas to explore, and making the gym leader more difficult than "le epic loser waiter who dies to your monkey". The only thing unforgivable is the god awful Pokestar Studios tutorial which is unforgivably long and tedious.
XY has some pretty boring tutorials but that's not nearly the issue with those games, it's more of how consistently bland and milk toast the characters are consistently throughout the adventure, including the friend group, villains, and gym leaders. My favorite is Korrina, mainly because her sequence with the Mega Lucario fight is pretty cool and memorable. No one gives a shit about that faggot dancing lard ass or the redhead shota, and Team Flare suck so much ass considering how much of the adventure they account for.
>tl;dr BW's first 3 hours do suck but BW2 fixes it, and XY's issue is not its tutorials but being consistently forgettable