Let Down

So on Monday, after about 24 cumulative playing hours, I beat Marvel Ultimate Alliance on "hard" mode. And guess what? It gave me the same stupid ending as I got when I beat it on "medium" mode. What the heck? So I just played through the game a second time through, only it was more annoying this time, only to see nothing better? What a ripoff. I mean, don't get me wrong, it's a fun game and all, just a little bit of a let down. That's all. Sigh.