The 07 Finals were boring but that had more to do with the Cavs not being a worthy opponent. 05 Finals were boring but Detroit and San Antonio were both excellent teams that excel in halfcourt execution on both ends of the court, so they brought out the boring in each other. On their own they're not boring. I love how dumb_suns_fan brings out massholes like Simmons to support his "arguments" when even Simmons himself says the Spurs aren't boring and have unfairly gotten a bad rap for a lot of the league's sins.
The Spurs have been involved in pretty exciting basketball over the years (03 semis against Lakers, 06 semis against Dallas, 04 semis against Lakers, 07 semis against Phx). And they can play any style you want: you wanna slow it down and grind it out, like Cleveland, Utah or Detroit does, okay, fine, they'll beat you in the half-court. You wanna run, okay, fine, they'll run and beat you at your own game, like they did to Phoenix in 05 and 07.