I'd say no if you're not a big DnD fan and want to support Larian. But yes if you are and do.
Paying full price for a game where act 1 isn't even finished yet and is a completely buggy mess is a bit ridiculous unless you just really care. People get really mad when you say this but I am not saying that the game is bad or that EA is unethical ( Electronic Arts is tho :P ), just that you need to know what you're getting into and be willing to essentially trust Larian with your money. I look at it more as supporting Larian than buying a game in its current state. Even if you got 60 hours out of it or whatever I don't think that says much, I don't like to judge games based on time invested. A game can be trash and 300 hours long while an incredible game can be 1 hour long. I don't consider an unfinished buggy game to be worth full price without this context of it being about supporting Larian. So no I didn't get my moneys worth, but I am trusting that I will in the end and that's why I am willing to part with the money. It's sorta like a pre-order.
If people actually asked themselves if they would've been okay with spending full price money on the game in its current state if it was final then I think people would've said no. It's worth separating the actual game in its current state from just supporting Larian, I think that most people feel like they got their moneys worth because of the latter and not the former.
I agree that I wouldn't recommend playing the game at its current state to most people, but it's amazing to me how pre-order of a game is fine but when you pre order the game and get something extra it's suddenly a scam