Considering all the trouble with the hardware the past few days, you may not have even seen them yet, but if you have, chances are you love the new cross-server BGs. I know a few commenters here said they didn't work out so well, but it seems like a good majority of forum posters can't get enough of them.
Reports from the front are saying queues are almost instant, and up to 40-50 games are going on at any one time. A guidie of mine said he hadn't been able to get so much rep and HK in so little time ever. MBAzeroth loves them (and says it's wonderful that Alliance are lining up to get killed-- although they're working on getting better), and Kissedbyluck over on the WoW Ladies lj group says she actually lost her boyfriend to the BGs (since they used to quest together while he was waiting for an AV game).
It'll be interesting, then, to see how this plays out with the new PVP system-- with rep and rewards so easy to get, will we see Blue hike up the requirements? Or was this how they originally intended the system to run? And for all the twinking going on, will we see more of it now since it's so easy to enter the BGs, or will it start to disappear as people get burned out quickly after playing the BGs for a few days straight? It's game on in the BGs-- see you there.