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It was too long and had too much content.
Seriously, though. In the last act, Baldur's Gate was so huge and took so long to explore that it destroyed the momentum of the overall story. (The evil army is invading! Oh wait, they are now hiding underground doing nothing, so that you can take your time exploring the city).
It felt like turning in quest coupons and getting your magic item/promise of aid and otherwise very low stakes.
In terms of pacing and stakes, it would have made much more sense for the PCs to have gone to Baldur's Gate earlier in the game to do all the "adventurers faffing around" stuff, then revisited the city during the endgame. Though it would have clashed with their "each act is one set of maps" setup.
Instead, in the last act we have Gortash, supposed 5D chess player, centering all his plans on the PCs flipping to his side. Then he sits back and lets them wander all over the city, undermining him. Ultimately, when they don't take up his offer, his backup plan is "whelp, guess I'll die".
Maybe the excuse is that the Elder Brain was making him stupid...
Would have been nice to finish the game then still be able to poke around in all the acts.