I am with you on this Zeru. I am currently in the middle of Act 3, but I felt quite like you when I went out of Act 2.

There were way less interactions I had with my team mates. Way less banter between them while walking through the underdark etc. either. They also didn*t really comment on a lot of things. I had Astarion, Karlach & Shart with me all the time and I tried to speak with them in and outside of camp constantly. They gave their two cents about
Nere, Isobel, the Moonlantern and after the fight with Ketheric, nothing else entirely. Although Shart had a few interesting moments in her story while we did the trial and saving Nightsong, the only thing I did for Karlach in Act 2 was finding her Iron, again. Astarion had nothing going on with his story in Act 2 either, that started in Act 3. I encountered one romance scene with Astarion at the end of Act 2 -after the fight with Ketheric. Big emptyness between Act 1, where I had little scenes throughout the journey & 3 for me. In Act 3 I had just one so far as well (at the circus and that was more or less rather random and nothing too important).

Some fights were okay (like the Nere fight, that escalated mostly on my part into something pretty cool). The big golem thingy in Grymforge was cool as well (forgot its name though, but I liked to use the environemental mechanics to get it down). Other than that I felt like the fights were pretty underwhelming.
Ketheric was a snoozefest. His presence as one of the 3 big baddies of the whole game was rather shortlived, too and he kinda popped up and was gone just minutes later. That felt rather weird. The only thing Keth did in battle was summoning a few corpses and he also concentrated his attacks on Shart only, while everyone else of my party stood far away.
The
devil you had to slay for Raphael was surprisingly easy too, thanks to him running into his own mines
. Isobel was something else and I am still unsure how to feel about the whole mechanic there. It was not that bad, but also not really good and felt like the game wanted to force me into a particular direction.

On a rather personal note: while playing Act 2 I started to feel less motivated to do side quests and also like the story started to drag on in some weird ways. Like you I also didn*t find most of the locations that interesting. I started to do more breaks inbetween play sessions and it started to become even more frequent after I began Act 3. I loved Act 1, bc I love immersion and all the things you could find and do there. And for someone like me, who values cpmpanion interactions as part of that - icing on the cake. Act 2 and 3 def. need more work and depth, the pacing between story, companion interactions and adventure seems kinda off in both following Acts. I am now at a point where I really considering waiting for Patch 1 to play further and see, if the experience feels a bit less bumpy and more polished. It is also hard to tell for me how much I missed out due to possible bugs and quest stoppers, but there is def. hard fomo on my part since entering Act 2.

Sorry for the wall of text, but it was something I thought about in the last couple of days a lot, bc I frigging love BG3 and the time I had with it so far. No native english speaker either so...sorry for eventual grammatical issues.