Celtic never ground out a win then? Guardiola himself has admitted that they only play one way, and cannot adapt too easily...would you not say that was just as much a flaw as a strength?
Celtic have but not to anywhere near that extent, we always tried to play football in Europe, might be why had such a poor away record but we went toe to toe with Barca at Parkhead a few times and came out on top. But thats the magic of Parkhead on a European night. I just dont think Barca have been the same level this year that they have for the last few, they only play one way but its the right way.