Christoph, I think that is a pretty fair assessment.
To me, 7 is a grade of a C (as in 70%). Not great, but passing. 6 is barely recommendable. I certainly flirted with that 6 for this one.
I think for people who listen to our podcast, we do recommend seeing it, and it wasn’t “Transformers 2″ terrible. We trashed it because it could have been (maybe SHOULD have been) much better. Which made it’s flaws so much more aggravating, and as such made us focus on them more than the strengths.
We probably should really sit down and define our warp ratings. In theory we originally planed them as an homage to Star Trek, but in reality we treat very differently.