I have a friend who also said before ME3 was out "Shepard probably dies at the end" and I do remember thinking "Please no. That would be so lame and for the sake of cliche". At this point though, I'm fine with it. It doesn't make the ending better, but it's also not the reason why it's a bad ending, plus I don't really care as much anymore, but the fact still pisses me off although it's probably more ME3 in general that felt like a punch in the stomach.
I think I looked like this throughout most of ME3 because I was so disappointed:

Keywords that triggered this reaction were usually "War!", "Save Earth!", "I want to control the reapers!", "Destroying them is the only way!", "The Crucible!", "Udina got what was coming for him!", Anderson stays at earth to... do what?, bad self-referential humor and pandering, autodialogue, bad side-quests etc. etc. etc.
That guy up there, who's about to pull his hair out? He's thinking "I LOVE Mass Effect!" but he just can't like what he's seeing. The ending? Yeah, that was just more of the same but about 10x as depressing.