Bioshock 2 is unnecessary

I'm about half-way through Bioshock 2, and I'm feeling pretty bored and apathetic. It's like the first game, but less interesting because we've done it all before. There're new characters that I don't care about (except when I wonder why they're still in Rapture some ten years after it went to shit), new gameplay aspects that I don't enjoy (defend things against waves of idiots), and some pretty serious pacing issues (the story hasn't progressed in some time; just sayin')... Essentially, I feel like I'm grinding through something very pretty that I've already finished. It's an engaging and satisfying game, but it's just not doing anything special.

Prototype and F.E.A.R. 2 are up next.