I'll pretty much agree with every one of your post's sentiments. This was a genius move by 343 and MS and I can't wait to play the older games online in 60fps and with DEDICATED SERVERS (perhaps that will improve co-op latency? Yet to be confirmed for sure but it's an idea of mine). I can't guarantee when I'll acquire an Xbox One to play this but it'll definitely be before December 27th because I want to get in on that Guardians beta.
ALSO, I did get the PM! I just haven't gotten around to trying the gametype, lol. Seems like it'd be incredibly fun to partake in in a big lobby. Maybe it's something we'll try next TTV Game Night (or a BZP Game Night, whichever happens first).