Originally Posted by DeepO
No.

Well, I haven't tested it myself, but there are all kinds of websites claiming that there are more than enough war assets to get that ending with no multi-player, including the Mass Effect wiki. For example (with imported character, apparently),

There is MORE than enough to get the Perfect Ending in the game (I did and so have many of my friends). Doing some multi-player will definitely help you quickly get the 5000 EMS required as well. (Emphasis mine)

http://isocrates.hubpages.com/hub/Ma…ination-Theory

So I don't know what to believe anymore. Besides, what are we talking about here,