try it, You won't regret it.
having read around six or seven of the discworld books (not nearly enough to understand what's going on in the series), I can still say that the books range from all over the specterum, so as long as you don't pick a sequeling book (I think there are a few of those, but I can't name them right), you should be fine.
it's funny as hell, and after reading them a few times, you can also look past the jokes and understand whatever crazy plot was going on.
catch22 is an amazing book. it's the kind of shit that school should teach you, instead of of Shakespeare.