I own (well, my brother does) the complete Viva La Bam series on DVD, and I can't really say its all that interesting. Sure its funny, and a bunch of guys are all making their lives a living hell while driving Bam's parents insane in the process.
Over all Viva La Bam is a so so series. Bam's Unholy Union on the other hand is a rip roaring good time.
As for Jackass, I've been in the hospital so much for breaking things and getting hurt (Since I was 18 months old, I've broken both my arms, my right leg twice, my nose at least 18 times, ribs, collar bone, crushed my eye socket and cracked my cheekbone) that I actually physically can't watch the show with out getting sick.