It's important for new players to realize the differences between MP and SP in halo. SP can be a great place for a newb to learn button lay-outs and get comfortable shooting at things. Though they should note that the weapon physics are different between MP and the campaign. Also, like GNOM3 mentioned, AI behaves much differently than live players (even H3's drastically improved AI) so don't expect your amazing brute flanking move to translate over to Live. If you want to improve at MP, then thats where you should practice.