While a lot of sequels are crap, some companies are really getting the stride for it these days. Thankfully the ones I play are single-player and non-addictive.

I mean, Mass Effect 2 was amazing and the idea that a decision made in the plot of the first game can effect the plot majorly even onwards into ME3 is so inventive. Bioshock 2 was touching. Sadly too is trash these days.