And it's fucking sad, considering most of those people are just going "OMG DEAN AMBROSE IZ GUNA CUM OUT YEEESSSS!!!!" without having the slightest clue who he actually is.
Believe it or not, quite a lot of people know who he is. Those who didn't brushed up on his videos/promos from before and during NXT. Check out the 'Dean Ambrose Pre-Debut' thread. For all of the random circle-jerking, there was a bunch of discussion of how he was going to debut, his past matches (vs. Regal, Rollins), and his past promos (spanning over quite a few years).
Get a grip. Not everyone is an oblivious jerk that HAS to jump on every random bandwagon. Sure, there might be quite a few people that want to cheer for someone they don't know about, but I'll bargain that most people supporting Ambrose actually KNOW him.