I, too, use questionable streaming sites (well, just one since it's been reliable for the last year or two), but the picture quality is often worse than standard def, and the sound is apparently funnelled through a tin can.
It's almost bad enough to make me want to pay for cable. Almost.
Unfortunately for me, I live in Canada, where OTA stations do not care about the NBA. And I refuse to buy the League Pass since any games broadcast on cable would be blacked out.
Honestly, I bought a TV antennae from best buy and a long HDMI cord for my laptop and that's satisfied all of my sports needs through OTA broadcasts and questionable streaming sites.