If H2A doesn't have the original halo 2 multiplayer with everything intact like ranking system, glitches, etc. not buying it. I got suckered once buying the first anniversary but not again.
I'd definitely look to see what they changed, if any of it is real. I mean, look at what they all did to Halo: CEA's maps in the Anny playlists. The Beaver Creek map had Grenade Launchers and Shotguns at each base, plus the Rockets, Sniper, and Sword in the middle. The area they introduced behind the bases was a campers paradise. It was awful. The Breakneck (Headlong) variant wasn't super bad, but the weapon and vehicle placement sure was. On top of that, armor abilities kill any chance of strategy in controlling the map. A map like Lockout should not have crap like Jetpacks on it, pickup or not. Pickups are suited for Camo and OS, which both last at 30 second timed intervals, and nothing else.