Greatest game? It's at least in the discussion for sure.
I haven't played the third yet, I'm poor and NO free time so I'll wait. Plus I'd like to get through another playthrough of ME2 as well.
But seriously, for me this game literally has it all. Characters I care about, combat that is addicting and not so hard that you are constantly frustrated, a story that sucks you in......
So I'm a Bioware fanboy, lol, sue me