Way too much to take in on this topic, so if this was already mentioned then forgive. The thing I keep seeing everyone talking about is whiners and group voting. I realized along time ago that only those in groups have a chance of winning and only those new to the site, that haven't learned the 'rules', are the whiners. I could care a less about the challenges section of this site, it's not why I come here, but since the groups are going to rule this feature then I think you guys should set some polices within your groups on how to handle newbies. For a while every time someone new joined the site it seem they got bombarded with challenges from all of the groups, and even though it's a game, when their car loses by such a drastic amount it does become upsetting and they're bound to complain. I say if you want to partake in the challenges then keep it only between the groups, give the newbies some time to adjust to the site and possibly joining a group or two before ganging up on them. And by now everyone should know how to turn off the challenge feature on their garage, if not ask and I'm sure a lot of people would be glad to assist...otherwise simply decline the challenge request.
"Whoever said the size of the dog doesn't matter, never met me!"