Besides saying the ending wasn't bad doesn't make it a good ending either. Next time you see those people you mention, ask them if the ending could have been better and if it should have been better.
I can suggest these articles: http://www.gamefront.com/mass-effect...ans-are-right/ and http://jmstevenson.wordpress.com/201...mass-effect-3/ or the series of articles on forbes.com if you want to know more (yes the ending is so bad, even Forbes felt it needed to highlight this disaster and the bad business practices).
The second article is a lengthy one but very good.
But what surprises me is why they even let themselves get into this situation in the first place. An experienced company like Bioware must have known that what they released was substandard and would not be well received. Pissing of your fans seems like such a stupid thing to do and a bad idea for any business.