User blog comment:Christina.goddette/Multiplayer/@comment-4043223-20120310215825/@comment-1691295-20120310225948

It's not just a matter of 'doing everything'. Your choices in ME, ME2 and ME3 will really affect what you get. I did absolutely every quest but ended with a measly 2880 War Assets because of my ME2 choices in particular, so I couldn't get the 'best' ending unless I did play Multiplayer. Unlike ME2 a 'perfect' ending in SP only is actually incredibly difficult.