Thiels can rock like crazy! My 3.6's have rocked for 10 years. If you have done any research you know they have to be fed properly! My recommendation is good clean SS amplification, tube preamp, and a high quality front end that is not in the "ultra detail" camp either vinyl or digital.
They are mercilessly revealing which can be very rewarding but any uncomfortable coloration upstream will be presented. If your willing to build your system around speakers from top to bottom then you have a much better chance of long term enjoyment from Thiels.
A bad recording is just that, bad. Unfortunately, if you listen to compressed radio music like Cold Play, etc....you cannot make those bands sound good on any playback. If your into classic rock, like me, the 60's, 70's, and some 80's pressings are unbeatable and that is why I want Thiel's in my room because they deliver the goods.