My problem with the ME3 "ending" was that it wasn't actually an ending, not only that but it makes no sense and is very uncharacteristic of mass effect and bioware (SPOILER: dead squad members appearing in the final cutscene alive). At the "end" you have a choice to make but regardless of your final choice and your choices during the whole journey you are given one of 3 endings which are almost identical. Here's some links if you're interesed.

Ending comparison:
www.youtube.com/watch?v=rPelM2hwhJA

Bioware's initial response:
http://social.bioware.com/forum/1/topic/355/index/9992961/1

Bioware's acknowledgement:
http://social.bioware.com/forum/1/topic/355/index/10098213/1

PR and financial analyst thoughts:
http://social.bioware.com/forum/1/topic/355/index/10084349/1