I'd have to go back and re-watch the BC game since I was watching it on my phone during a wedding, but check downs definitely are not the norm for Matt. I'd say he has a really nice deep ball (though he won't be throwing it 70 yards through the air or anything like that), and had a real nice back shoulder throw to the sidelines. Some of this could have been due to Jalen Coker catching literally everything thrown his way, but Matt tended to be able to put the ball in spots where only his receiver would be able to catch it.
I think some of the check downs you saw in the BC game were due to 1) wanting to try and keep ball control against BC and 2) partly influenced by the weather. The last time we had played BC, they beat us 62-14 and we it was effectively over midway through the first quarter. We were a team built through our OL and power run game, so just getting consistent positive yardage against an FBS opponent helped us neutralize their size/depth advantages. The game also had a very suspicious 2 hour weather delay with HC getting the ball back down 3 and 2 minutes to go. Matt should have had an 80 yard TD run the first play back, but just stepped on the sideline when looking behind to avoid any tacklers.
It's probably not surprising, but he lives and dies by his running ability. He has more speed than you would think when looking at him, and he'll beat defenders downfield either by juking them or taking them on head first. Watching him scramble is really, really fun. He has an knack for being able to adjust to defenders 10 yards away and would turn a 5 yard gain into a 17 yard gain for example. We ran a lot of designed QB run plays, but a ton of his yardage would come from a broken play and Matt playing hero ball.
To play both sides and not be a complete homer, he does have a bit of a funky throwing motion and I've been told his footwork could be improved as well. I would mainly be concerned if he's getting pressured from behind, as I could see his throwing motion leading to strip sacks if he's not careful, though I honestly can't remember him getting caught from behind much. He would miss a throw every now and then, usually when scrambling, and I think he would get mentally caught between running and passing. I think he can also be a little too overconfident at times, and would press trying to find the perfect play. The Harvard game we lost this year was probably a good example of him trying to do too much and it cost us. Though, there are too many games too count of his where he single handedly won us the game.
If you want to look for specific game highlights to get a feel for him, I'd recommend any FBS game (UConn 2 years ago, Buffalo last year, and then BC and Army from this season.) The South Dakota State game from the quarterfinals last year is another good one. SDSU hadn't allowed a team to rush for 100 on them all year and Matt ran for like 250. Also the New Hampshire game from the 2nd round last year. Absolute trash weather the entire time, but Matt was running like he was a fullback the entire game and theres a fun highlight where he score a TD on a run where his helmet flew off. He also had a shoulder injury this year that we think happened during Lafayette when he ran for 330 yards. He ended up missing our next 2 games, but still rushed 3 times for 3 first downs in those games, so his stats last year are really only through 9 games not 11.
Probably way more than you guys needed to know, but feel free to ask anything else I may have missed.
