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The Skinny
Mike Hull was a four star linebacker who picked Penn State very early on in the 2010 recruiting cycle (during his junior season) over offers from Michigan, Pitt and West Virginia. Buried for a bit on the depth chart behind a ton of talent at Linebacker U, he finally got the chance to see significant starting time his junior year once Michael Mauti and Gerald Hodges graduated--but it wasn't until this past year that he broke out for good.
The 2014 Butkus-Fitzgerald Linebacker of the Year had a record senior season in the blue and white, logging almost double the number of tackles of any other player on his squad with 138 (75 solo), alongside 10.5 tackles for loss, 2 sacks, 1 interception, and 1 forced fumble. That's kind of pretty good--fourth in the nation good. And all of that while playing on arguably the best defense in FBS.
What You're Getting
Scouts are knocking Hull for his size (both height and arm length), but there's no denying that he's got a nose for the ball. He was the quarterback of Penn State's top ten-in-nearly-every-statistical-category last year defense, calling the formations pre-snap; he was an absolute ball hawk, and even if an offense took him out of a play on one down, he came back immediately to make the play on the next.
After playing three years on the outside, Hull transitioned incredibly well to the middle his senior year, and that's where he's projected to go--though some do see him as an OLB due to his size. He did well enough at PSU's pro day and the combine, running a 4.64 forty and going down as a top performer in the bench press, three cone drill, and 60-yard shuttle, to couple with his monster season to go in the draft rather than sign as an UDFA like former teammate Glenn Carson.
Mock drafts have Hull going anywhere from the third to sixth round, so expect him to be taken on the final day of the draft by a team looking for depth at the position, as well as versatility.
tl;dr
Though his size his a valid concern for NFL draft scouts, I simply don't understand concerns over his athleticism--he was an outside linebacker, and sometime hybrid safety, for Penn State for a reason. If he falls to the later rounds, whichever team picks him up will have gotten an incredible value pick for their roster--a plug and play player for special teams virtually right away, and potentially more later on.