It does really. Especially since the plot of the second game is essentially "You know, the first Vault turned out to be a prison for a really nasty creatures. Let's go open the second one as quickly as possible!" (And from previews I have seen the 3 one is "So the second vault was also a horrible prison. Oh well, third time's the charm!")

As for the difficulty, Tediore guns didn't make it any easier, since you not only had to figure out how the gun shot, you had to learn how the disposed (and now explosive) weapon arced and train yourself out of manually reloading.

The best is the Tediore rocket launcher. After you shot the last rocket in the clip the launcher launches itself.