They paid $9.6m this season. They got $9.6m worth of QB play. Either way, that's not the point. Eli got paid after delivering us one SB, and has since delivered another. If you don't think that's worth the money then you need to find another sport to follow.
He got a $100 million contract. Expect better play than we saw this year. He has shown he can play at a higher level. Just expect it to be more consistent.