Depends on who you want to be anonymous from. Message boards, silly websites, the yes, VPN provides that layer. Anything where you merely need to be not your ISP IP. Drastically increasing the odds that you would never get caught torrenting. Yep.
Anything more than that, you move over into the Tor+VPN realm to reach a higher level. I'd say 90% of people have no legitimate reason to need more than a VPN alone though.