Honestly, first time I watched it I had a headache. I know the twist in it now and how it worked out and etc, but I still find myself noticing things I didn't previously.
It wasn't as bad as people say, just a little disappointing, and the ending was a bit sad. If you look at what it's trying to tell you, rather than the perception if what it's telling you, you might enjoy it.
Triangle was genius!