They finally released the Heretic + Hexen double pack on the Xbox, so I've been playing those in co-op. We started with and have finished Heretic so far, since it's chronologically first. With how many DooM mods there are these days and even officially supported on consoles, there's not really anything about Heretic that makes it stand out anymore like there may have been back in 1994. That said, DooM's general gameplay is always fun, especially in co-op, and the different set of weapons, enemies, and items still put it above the average DooM mod.