I just find it needlessly complicated, they went into what....5 level of dreams just to utilize that "every level time slows down by 20 times" concept, and it wasn't a very interesting concept to me either.
The only good bit was the opening when you have no idea what is real and what is not, however once they explained everything, it's very expected. Wife comes back to haunt him, complicates the crucial part of the mission and everything.
and oh how they had to create drama by saying they didn't know one of their team member has been trained against someone else entering his dream, surely they should knew that or he would have mentioned it?