It's unfair to qualify Marcus Mariota and Ryan Tannehill as bad. But you'd also have a hard time calling them good.

So when the Tennessee Titans traded for Tannehill on Friday, it set up a quarterback battle no one asked for. It's an event no one really wants tickets to. It's going to be the controversy we wish we didn't have to read about. So now is the time to introduce this quarterback battle to the world, so that we can all enjoy its high comedy, because we know we won't be watching high-quality football. 

Keep in mind: the Miami Dolphins traded Tannehill at a moment when their only other rostered quarterbacks were Luke Falk and Jake Ruddock. Tyrod Taylor and Teddy Bridgewater had also just passed on the opportunity to be starters in Miami, with the two veterans choosing backup roles instead. No one seems to want play quarterback for the Dolphins. And still, they looked at Tannehill and said, 'Nah, we're good.'

The Titans, meanwhile, saw another boring, replacement level quarterback, and said, 'Yes, please!'

It's important to note that the Titans' quarterback room should be the envy of a handful of NFL teams. They have a starter in Mariota, who has seemingly been on the verge of breaking out for years. They have a backup in Tannehill, who is competent. It's a better situation than what the Washington Redskins have. But we've seen this play out before: Mariota will struggle. Tannehill will enter the mix. Tannehill will struggle. And then the Titans will be back at square one.

Mariota's position is already tenuous with a pesky hamstring and a proclivity to throw interceptions. Over the past two seasons, Mariota has thrown 24 touchdowns to 23 interceptions. It's hard to say what's less impressive: 24 touchdowns in two seasons or his touchdown-interception ratio bordering on 1:1.