The issue is that many game design decisions have been made explicitly for the benefit of MP at the expense of the SP experience, for example how party movement is handled.
I didn't mention party controls as I am doubtful if this is a choice that favours multiplayer. I can't see how it would make multiplayer experience better. In the best case scenario (full on 4 player coop) one controls one character and the game plays about as well if the game used the classic system. Also most post KOTOR Bioware singleplayer RPGs used similar control scheme - I suspect Larian is just following the newer trend.
