Well, before going into it, it is pretty easy to know if you will like it.
Here you go:
Tree Of Life is a very long, visually beautiful movie with no plot and multiple settings whose purpose is to invoke feelings of nostalgia and get you thinking about the universe, the purpose of life, and your family.
Did that sound good? That will pretty much dictate if you like it or not.
I think it is a great piece of artistic film, and is more of an experience than entertainment. I can absolutely see how 80+% of the people that see it do not like it.