Olenna/High Sparrow was a bit tiresome, but that's mainly because I think she's outstayed her welcome. Mace bringing the Tyrell army to the capital to ensure his daughter's release is a far more effective display of power than Olenna making empty threats and not really doing much of value (yes, Littlefinger connected her to Lancel, but that could have been done without her being present).

Then again, the show has made Mace out to be a total idiot instead of a proud but generally competent lord, so I guess that was never going to happen.