I wasn't disappointed. I found the battle to be enjoyable and intense.
Although I did find the first phase of the battle to be rather easy. The second half gave it more of a challenge, and had a unique aspect to it.
I disagree. The Demise battle was one of my favorite ending battles of all Zelda games.
I do not think it was the hardest battle ever, but it wasn't the easiest. If you used guardian potions and health potions i'm sure it was much easier, but i didn't use any potions, because i wanted the full effect. Did you use potions? I did think it could have been a little harder, but for me it wasn't to the point where it was disappointingly simple.
I wasn't disappointed in the slightest. I really love that boss battle, and had/have a lot of fun with. The only thing that would have made it better is if it was just a little longer with maybe a third round. Other than that, no complaints from me about the Demise battle.
I honestly didn't know how to beat him the second phase and thus was killed by him 3 times before I finally got it.......it was surprisingly hard, but for some reason the battle with Ghirahim felt more epic....probably because we knew him more than Demise?
I don't think it was too easy as far as the pacing of the rest of the game goes. Ganondorf from TP was beyond easy and he's my favorite boss in all the Zelda's. What got me is that there wasn't much too it. It taking place in the sky (kinda like where Link and Zelda were at the end of OoT) was good and the ability to sommon down lightning was fun, but really there wasn't much to it. Despite how epic it was supposed to feel, it felt really generic to me.
So my answer is yes, I was disappointed