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The levels are an issue, but not for the reasons most people use. The real problem is that many of the wild mons you'll get after reaching Ecruteak don't get any stronger than they do before. This means that any new member of your team has a lot of catching up to do, whereas in the past gens they only need some leveling to get up to speed with everyone else. This becomes even worse in Kanto too, where wild Pokemon still use levels based on RBY encounters, so a new mon that's either exclusive there or much easier to get there will be far lower than anything else, whether it be opponents' teams or your own Pokemon.
BW2 shares the Unova region from BW1, but it is much better in terms of levels. Wild Pokemon's levels have been adjusted so that they are based on where you encounter them in the game. Route 1 now houses high-leveled Pokemon, which is around equal to where the player is in the game.
There's also tiny issues like Headbutt being a field move but unavailable as a TM, when it was readily available in Gen II among other things.
