halo 1 - lots of fun, played it a lot 9/10
halo 2 - bored me halfway through, had no online, never played again, so 5/10
halo 3 - missed the halo 2 online train, so halo 3 online just felt awful after all my cod 4 time, 5/10 if that, boooorrriiinnngggg single player, and i just dont like the guns or the jumping for online
never played halo wars
halo odst - now if this was halo 3, i woulda liked it, 8/10 much improved sp, cool new online modes make the flaty shooting more bearable