I liked Men In Black 3 but some speculate if it's as good as the first one and I would say no. The first one really has that charm of discovering all things in the MIB universe for the first time, like J the audience is also experiencing all these cool surprises at the same time. But this movie had its own mystery elements that I enjoyed, including the time travel bits and theories.
Gotta say the alien makeup and creature effects were also a real treat to watch. Loved some of the new weapons and gadgets, my only complain would be some of them didn't get enough screen time. I wanted to see more of that Shotgun.