
Due to me not being good at Halo, I didn't like the amount of time it took for me to unlock things. Also, the campaign wouldn't save, and I couldn't use half the features because the game said I didn't have a hard drive xD
I actually prefer Battlefield: Bad Company precisely because of what prophet said. The bad company story lines are unique and comical, not some recycled "Russian with WMD" plot. BF3, however, has a lame plot and is chock full of bugs, but I still prefer it over COD simply because I'm better at it and I like vehicles.