i dunno, to me it was worth buying. i got 12 or so new maps,(i only had them on my dads xbox) a great Campaign(it was full of slow scenes, action scenes, and funny scenes) that was new and refreshing especially since im not some super soldier jumping around shooting like there is no tomorrow. its a nice change of strategy knowing that, if i get shot, im going to hurt. then there is firefight, which is like a first person Halo version of the horde, and now i happily have recon. i feel like i got what i payed for.
though, there is some flaws towards the game. like, if you shoot your silenced pistol, it alerts enemies (wtf bungie?) and, instead of the halo 2 pistol with silencer, i would rather have a single shot BR that was silenced. because then i could actually kill people with it =D. but, all in all, its a good game imo.