Just got to Chapter 7. I'm liking it quite I bit. I don't think that by the virtue of being able to craft weapons that it has become more shooter centric. It might feel that way with all the gun options but the core game play isn't really different.
I think it's worth a purchase and I'm a big fan of the first two. It's different on many levels but I still think it's a very good game on its own. Lot's of replay-ability just like the first two as well.