I would say that if you're going to watch it, pay the $10 (of find a second run theater that'll let you in for $5-$6). I think that action movies don't always translate nearly as well to the small screen.
If you go in expecting to see terminators fighting and fancy special effects, you won't be disappointed. If you expect the big ideas like transhumanism like McG thinks this movie addresses, or a strong plot, then you will be disappointed. For me, it's much easier to suspend disbelief and focus on the former in the theater; if I watch at home, I'm always going to be obsessed with the shortcomings of the latter.