Fun fact: In the Japanese dub of FiM, Nightmare Moon has the same seiyuu as Virizion.
And to answer your question, I DID see Pacific Rim. And I have to say, it was AWESOME.
For your question, yes, I've seen it. At first, I find it cliche about the idea of giant robots/mecha-suits fighting giant monsters in American-made film. Overall, it's nice to see from a different perspective, such as CGI, characters, and storyline.
Its the little things that make it all that much funnier!
YOU SHOULD WATCH IT.