http://tvtropes.org/...in/GainaxEnding
Seriously, you Mass Effect fans think your ending sucked? Try being a fan of Neon Genesis Evangelion, then come back to me about terrible endings. Oh, and the "extended cut" of that series, End of Evangelion? You think the refusal ending was a middle finger to the fanbase, you haven't seen ANYTHING yet. If refuse was a middle finger, EoE was a full-on violent rape to the fanbase. It makes refuse and the ME endings look like the best endings of all time in comparison.
Thank goodness for the MEHEM equivalent for Evangelion, which is the fan written ending taking place after (and sort of during) EoE. It's actually a manga, that is several chapters, and the artist who did it was so good at replicating the artwork of the real manga that it's almost hard to believe that it's unofficial. There are sex scenes though, very tastefully done though, and there is an "all ages" version that doesn't include them. I think the adult version is better though, those scenes actually have good dialogue and add to the plot. Still, either version works. The name of it is "Evangelion RE-take".
Bottom line, Evangelion actually mirrors ME quite a bit. Both had an original ending that was just stupid nonsense, both had a new ending added because of criticism that pretty much gives a middle finger, and both had a fan made redoing of the endings that make things end on a much better note then any of the official stuff. Difference is, Evangelion's nonsense original ending is worse then Mass Effect's, and the extended cut equivalent is a much bigger middle finger then the refusal ending could ever dream to be. It's like ME3's ending made several times worse. Thankfully, RE-take's ending makes it all better and makes you think back on the series fondly instead of with sadness and rage.