Disappointing? Yes. But it's not nearly as bad as the internet in general would have you believe.
You should prolly try reading this. Not too many people think too much of the ending to grasp how much Bioware screwed you.
http://www.gamefront.com/mass-effect-3-ending-hatred-5-reasons-the-fans-are-right/2/
--
http://i.imgur.com/bIsh6.jpg
http://oi56.tinypic.com/30bk00y.jpg