I am fine with the ending, really you saved the world who cares what happens
My problem was, I wanted to take over the world with my friends. But that wasn't an option, me and the other party members spent all this time planning all these cool things only to be forced to be "The heroes of Baldurs Gate" or
Just me executing the mindflayer grand plan with them as mind slaves for no reason
YOU may be happy with saving the world. But there are hundreds of options in this game, they should not lead to a binary black or white ending.