Sound quality wise nothing beats a THX hall since the sound can even track accross the screen... But i personally find that the new D2D projection systems with a well calibrated projector beats THX interms of visual.

Worse cinema i've been to would be Tropicana City Mall, after a few times i concluded anything there not on digital 2d cant be accepted by me, the tapes are badly stored with scratches and the projectors are not aligned nor properly focused to the canvas. Sound sometimes feel like its constantly switching between 2.1 and 7.1 ...