I have seen GI Joe. I wouldn't call it a masterpiece of cinema but it is certainly better than ROTF with a simple but coherent plot and fun throughout without any killer bits (like testicles, dog humping, etc).
Overall the action could also be deemed as better choreographed than Transformers with the exception of the forest battle but the CGI effects were certainly inferior to TF2 but used to better effect.
My biggest gripe with the movie was the whole Baroness back story but it wasn't as killer as soft porn pretenders or pot brownies.
It is clear that the people behind the movie did do their research as it was filled with obvious and subtle tributes throughout.
This movie fits more as a 'dumb summer fun' than ROTF as it doesn't have as many tedious bits to endure.