I also have mixed feelings with Banks. I really like his idea of the Culture, but some of his books are really terrible. When I read them I enjoyed The Player of Games and Use of Weapons, but I disliked a lot Consider Phlebas and had to abandon Matter after a 20%…

Yes, I found it confusing that sometimes there is a warning which has no consequences, then in anothere you get locked from all previous maps. Also with time-sensitive missions, you can fail a few quests and it is not always specified that there will be consequences if you take too long in your exploration (in a game that is all about exploration)

The problem with these games (like Stellaris, which is also on offer and I would recommend with the same warning) is that the base game lacks many interesting features, which you only get if you buy all the DLCs.