I really have no issues with CLE. This is a small airport in comparison to my home airport of Chicago O Hare. No matter what time of day I arrive it takes less than 5 minutes (once it took 10 minutes but that was Thanksgiving travel week) to check luggage and get through security. You can't beat that. Everyone is friendly and courteous.
Only issue I have is food options. Why are there better food options outside security than inside the airport? Doesn't make sense. And if you fly United be prepared to walk to the end of the airport to find a Starbucks. That's just wrong. I need my $5 flavored water, oops I meant Starbucks refresher, easily accessible. But they do have some yummy gelato inside the airport, so that's a plus.
This airport is convenient, easy to fly in and out of and has some reasonable onsite parking options as well. Considering I fly to work every week through this airport I can't ask for anything more.