What can I say? You're absolutely correct.
Act 1 was very good, Act 2 was ... variable (parts of it were very good, while others were pretty bad) and Act 3 is quite frankly rather bad.
So, essentially like D:OS 2... which got better with the release of the definitive edition. We can only hope it's the same with BG3...
Yeah I agree, act 2 felt underwhelming but now in the city, its not to enjoyable at all. Its a lot smaller than it should be and unfinished. I do hope they release a patch to fill it in.