I don't know about you all but I count the stuff at the elven temple as part of the ending. I just try to ignore the part where after we're done with the elves I have to go have a conversation with Flemeth then go back to my war table and say "Ok, I'm ready for Corypheus to catch me with my pants down." Its kind of like if you did the Siege of Denerim, carved a path to the roof of Ft Drakon, then went back to camp to chat with your buddies only for the Archdemon to show up because you forgot to kill him.
But while I wasn't really keeping close track, it did feel like my choices had some impact during the elf temple sequence. If you did the side quest involving Calpernia, you can show her evidence that Corypheus is using her and avoid a fight. I know I actually had to fight her the first time.
And of course, the choice regarding Morrigan and the Well affects whether you are have her help or have to go catch a dragon yourself.
But overall I did experience disappointment with the ending too. Not because I didn't get a larger battle or have more of my choices reflected but because the villain feels underdeveloped. Never do I feel that more than with Calpernia actually. The camera shows this random blonde girl like its all supposed to be ominous and a big deal but I was like "Who is this? Have I met her before?" I only remember her name now because the effect of the sidequest on my second playthrough but she still didn't feel like anyone I was supposed to care about. Kai Leng may have been annoying Manga Nightwing boy but at least he made me want to kick his ass.*
What I will say for it is the second playthrough, I found the ending was better than I remembered it being. I think once you get the disappointment out of the way and your expectations are sufficiently lowered, its not that bad. I know thats not what anyone wants out of an ending but at least on future playthroughs, I don't think this ending will be bugging people quite the way the ME3 one does. At least you can get it over with quicker and everything leading up to the battle is pretty good.
*Actually, I wanted to kick his ass more. It would have been satisfying for many of us but it would also have played into their botched theme of Commander Shepard slowly being worn down and almost cracking over the course of this game. The fall of Thessia really got to him/her, why not show it here?