Niggles: That sounds like an incredible amount of bugs (anyone got an idea if this is normal? - for a beta)
JinseiNGC224: While someone else might have a better explanation, hedwards right above did mention how Wasteland 2 has had a lot more time in beta than many other games, and it's not over yet. It could be that other games don't have beta tests that report so many bugs because the beta tests are all internal staff/testers, or the beta just wasn't long and they didn't care to flesh it out because of time constraints. This is the wonderful part of crowd funding and freedom of the developer.
As a genre, this type of RPG is just astonishingly complicated to get right. There's probably a huge number of interactions available and no particularly good way of ensuring that they're all reached. And then there's the players that deliberately like to play in ways that the developer didn't anticipate.
You can apply Monte Carlo testing, but even that is likely to come up short with software this complex.