I think the conspiracy theories about House planning everything are weak at best, considering the lengthy inner dialogues he was having throughout most of the episode. Also, he had no way of knowing that Foreman and Wilson were going to find him in the burning building, or that the roof was going to collapse at that moment. I think him faking his death was poorly written and overly convenient certainly, but not a conspiracy.
I guess that's what's bothering me about it. It just all seemed so contrived, and I've seen it before (fake death and dental record switch.
I also agree that the very end with House and Wilson "riding off into the sunset" was fine, and I supposed that scene was as good of a way to end it as any, but I wasn't too thrilled with how they got from point A to point B.
What would I have done different? I don't know, frankly I'm not sure what the proper conclusion to this wild ride should have been. But I just know that last episode left me unsatisfied.