Actually, you can't put weapons on the map with the Grifball setting, so everything has to be Personal Ordnance, but the way I made the gametype, the P.O.'s work more like ammo re-supplies, being basic drops that occur more often. I've had some really fun, really good games on Harvest, Wreckage and Skyline. We just have to get used to the instant arm, the epic battle beforehand is what makes it work, kinda like in 1 Flag when they've got your flag and they're headed home. Once you set the team respawns to occur only on each teams 1/2 of the map, with a anti-respawn zone just around the bomb plant, it works well for some fast-paced action.
Oh yeah, and the maps and gametypes are in my fileshare too, so anyone who wants to check 'em out can do it. All the "Oldschool" maps have weapon spawns like Halo 3, and all the MMHC maps are set up for Neutral Bomb <or it's mildy goofy cousin, that is. My Oldschool gametypes, unlike many others, aren't faster than Halo 4 because I don't want to go back into matchmaking and have it feel slow. The only thing that's changed is the balance. Instead of everyone having power weapons randomly, they're more of the "fight for the sniper and rocket launcher" type of games, and those weapons are found in similar places to where you'd find them in Halo 3.