Park & Jet is fine, but so is the "green economy lot" at Metro--we've used both (as well as the Ramada Inn park & fly package). The car was right where we left it on those two occasions. We've also done the Marriott package and the Fairfield Inn offers a park & fly for under $90. One night stay with 7 nights parking. We were gone longer, but it didn't cost a great deal more for the extra few nights.
I don't recall the economy lots at Metro being more expensive than the off site parking. It may well be, I just can't remember it impressing me as such.
I second the curbside check-in--usually quicker at Metro AND that's where you'll be dropped if you use one of the offsite/onsite parking lots.
Ditto the comments from Robin including the Toledo airport. We'll be flying from there in two days. Toledo is a much smaller, friendlier airport--you just can't get a straight shot! It's always something. . .