**Disclaimer: I'm not a professional reviewer, but I do know film. Critics who review movies has a specific job, and that job is to completely pick apart a film. I'm presenting these reviews in a different way; as an average movie goer looking to be entertained. I love movies, and I watch a lot... so I'll let you know if I think it's better in the theater, or if you can wait until you get it at home on the couch, or if you probably don't need to waste your time. Also, these are short and to the point; I'll link to longer reviews.
Should you see it? If you like.. huge summer blockbusters, sci fi, action:
short answer: Absolutely.
long answer: Go ahead and plan a time and buy your ticket now.
I'll start by saying I'm a huge fan of Guillermo Del Toro. His work with Pan's Labyrinth and Hellboy established him as a visionary director who can accomplish a lot on a very small budget. Needless to say, I was anxious to see what he could bring to the screen with a blockbuster summer budget, and I wasn't let down at all.
Normally, I would be hesitant to build up a movie this much, but I think you know what you are going to see from the get-go. It's a monsters v robots movie that appeals to a modern day audience. The script is rather weak and often predictable and the acting probably won't win any major awards, but that is made up in the scale of what you see on screen. And that is exactly why you should see this in theaters rather than wait until the home release. Well... that, and Charlie Day channeling his inner Rick Moranis circa 'Honey, I Shrunk the Kids.'