Yeah, I would certainly not characterize TPR as a magic bullet, claim that it would fulfill all your language learning needs, or that by using it alone you will achieve complete fluency.

I view it just a great way to jump start vocabulary and grammar learning and comprehension. TPR will need to be supplemented with other techniques, especially for production of spoken language, pronunciation, reading, writing, cultural sensitivity, social cues, etc. Also, in my experience, TPR has been most effective in one-on-one sessions with a tutor, while there's something to be said for classroom instruction where the student can interact with other students, and something to be said for interaction with native speakers of the languages outside any kind of formal instruction.

So, yeah, TPR is just another tool. A tool which I've found useful for certain purposes, but not the ultimate be-all-and-end-all of language learning. Is anything?