In comparison, I find he Groups noisy and pointless.
I used to try and put forth some genuinely helpful answers, and also made some good connections from it.
For the Groups, unless they are heavily moderated by the Group owner they devolve quickly into total crap. People either post pointless spammy press releases, links to lame blogs, or respond to questions for help with a problem with horrible product suggestions.
Answers evolved from a Q/A section to a just another portal for a social media expert to just refer to someone in their network. It was really annoying... The shutting down of Answers should be a warning to anyone that is trying to build credibility on a network, it can close at anytime and all your answers/reputation is gone