I think the whole "thing" with ME3's ending is to have a "thing". Due to how complex the game was there's no way that BioWare would have been able to make an ending that would appeal to all people.

My biggest peeve?

SPOILER!!:
Thane dying. Seriously! He was my love interest in ME2 and I chose to continue that in ME3. He died and I was past the point of getting the Paramour achievement when I finally figured out that it wasn't gonna happen.



I did the Synthesis ending. Yah, the green glow was kind of creepy... but I still liked my ending.