I hope it's possible to at least get to the 80s in this event. I started in my 50s last night too. Hit 60 yesterday, only played like 2-3 hours though.
Yes Horde does give XP... but I think if you do it by normal matchmaking it's pretty slow? idk, I was getting like 3k per round. I hear insane is the best way to do it.I think they say KOTH & Wingman give the best xp (plus easier to boost)
Unfortunately there are no tickers this time so the security trick (let enemies run into the lasers) is hardly fullproof...
i don't think this will be the last xp event for gears 2 ever though. I am hoping they'll do something for the holidays.