For every tall guy with a big arm like Flacco that succeeds there are 3 Kyle Bollers as well. Under 60% completion in college is a massive red flag. Jake Locker is the last guy to go high that was so inaccurate in college. Is he lighting up the league? He's a bust, even if the Titans don't know it yet.
Not a huge Glennon fan, but Locker was a scrub in college. He threw tons of "Vick like" ground balls against crappy Pac 10 defenses. I don't think Glennon is that much better than Locker, but most are suggesting taking a guy like Glennon in round 2 and not wasting our 9th pick on him (like the Titans did taking Locker at 8 or the Vikes taking Ponder in the 12th. )
He is a gamble, he can be a stud or a scrub. Too talented to pass up in the 2nd and too inconsistent to take at 9.