That's fair, at the time there was no way to know that Mayfield would be available on the cheap, I'm guessing the Browns would've had a high pricetag for a trade at that point. If it's true other teams were talking to Indy about Wentz the team had to do what it could to get him.
I guess the thing is Wentz has performed at one time at a level above what Mayfield has done. Will he recapture it? No way to know until the season starts, but he does have a high ceiling. Granted it's been 5 years but if, and it's a big if, we get that player the 3rd and second rounder and pick swap will be worthwhile.
If it doesn't work out the trade will look like we got screwed. My prediction is Wentz has a better year than Mayfield, wherever he ends up.