While I can get that gist for the first movie, seems kinda ironic and/or off to say the same thing with the 2nd movie considering much more of it took place on Asgard and/or the other realms than on earth. I liked both Thor movies. Both about solid 8/10s in my book with the 2nd being the expected level of extra-ness that a sequel is required, albeit not really on a mind-blowing scale.
I get and share the sentiments with Ironman 3 though, as despite it's flaws and hate, I was thoroughly entertained by it and liked it. Only reason why I still don't own it yet on blu ray is it's ridiculous Ironman price tag for it (shyt is still going for 29 bucks at the majority of stores, similar to how part 2 took years to finally go down in price as well. I really liked the Mandarin twists for the same reasons you mentioned as well as sheer entertainment factor, however, I didn't like the very end's all over the place in tone (shyt had inappropriately timed humor at the same time as near-tragedy instances) and end result for the climax. Pepper ultimately being the hero?!
Tony's suit getting getting torn to pieces with ease by just suped up humans.