I actually posted a similar thing on the steam forums as this thread's topic. I felt the ending was abrupt and disconnected.

It was random lines from random companions. They asked about doing a party and I agreed and next thing I know I am running down a pier to a different spot talking to Karlach. Which was totally confusing. No party scene or anything, just jumped into the future or something.

I romanced Astarion and I was totally upset that he ran off and just had Gale laughing about how we wouldn't see him again and I was just like "excuse me!? What does that mean?" It was just weird that a party member I had in the group exclusively was talked about that way and that I was his romance partner and I was like meh...no reaction about it. I put a lot of effort into making sure I got as many cut scenes and high approval with him for it to be all meh and indifferent. I did get his "good ending" scene, but it would only trigger if I let Karlach die. Then it was very bland. Just a question about what we were going to do now. There was zero intimacy to it. No hand holding, flirting, hugging, or even kissing. It didn't ring like we were a couple, but we're just friends shooting the breeze, which was really surprising with how amazing the cutscenes on his story arc were for him exposing his thoughts and feelings and confessions. Hug and graveyard scenes we're just *chef's kisses* and this ending was so vanilla.

Please, Larian, fix the endings.