Regardless of what happens in game 7, Horford has been worth every penny of his contract in his two season with us. I'm as frustrated as anyone with his dismal game 6 performance, but that doesn't diminish what he's done for us.
We reached the ECF last year with a team with lots of weaknesses. We could very well have been knocked out of the 1st round against the Bulls without Horford.
This season he's been healthy for the most part, and has been the stabilizing force that helped us to win as many games as we did (to secure home court advantage) despite all of the key injuries we've suffered. He was great against the Bucks in the first round - a series we'd have lost without his solid play. He came up big in game 7. He's a primary reason why we made "the process" look overhyped despite everyone counting the C's out. And now we have a chance to advance to the finals, something that not even the most optimistic C's fan would have predicted given how shorthanded we are.
I could go on and on about what he does for us - leadership, defensive versatility, intangibles on the court, etc. But I think two ECFs in a row speaks for itself.