Obviously, my opinions, I very much doubt these will be the first five drafted:
1. Johnny Manziel.
Extremely rare feel for the game and terrific leader. Improvisational genius. Might see a spike in interceptions in the NFL from his risk taking nature, but if Andrew Luck and Andy Dalton can throw picks and win games, this guy can for sure.
2. Jimmy Garappolo.
I know this looks way too high, but the more I watch him the more I see Aaron Rodgers melded with Tony Romo. Excellent feel for the game, great improviser, very active feet that helps him set quickly, very accurate, very smart. Mobile.
3. Teddy Bridgewater.
Really smart QB who almost has it all, though it would be nice if he wasn't built like a twig. Usually QBs as skinny as Bridgewater tend to fear pressure a little more, so he might need a team with good protection. He's a very natural QB so he could be good even as a rookie with a dialed back playbook.
4. Connor Shaw.
In reality, Shaw will probably be a UDFA and the odds of him ever starting a regular season game are pretty low. Shaw doesn't have a good arm and is under-sized. He is more than mobile enough though (one of the best forties in the draft among QBs), and his instincts and feel for the game are second only to Manziel. Very smart player who threw just one interception last season while playing for a high ranked team in the SEC. Terrific leader. Reputed to be a very hard worker. Wins a lot of tough games. The similarities to Russell Wilson are pretty obvious.
More than the wins, it's the numbers that jump out. 24 TD, 1 Int, 8.6 YPA. In the SEC. He looks the part too with his footwork, mechanics, and habits. Only reason I don't have Shaw higher is because it is likely a lack of opportunity will doom his career.
5. Tahj Boyd.
After Shaw there are a bunch of QBs bunched together. I know Boyd isn't perfect, but of the group he seems best equipped for the new NFL.
Boyd is mobile and can improvise well. He's not the greatest decision maker sometimes, and in a game where it's hard to separate QB performance from WR performance, it's worth nothing that his WR group was the best in football the last two years. It's possible he's a mediocre QB made to look good by throwing to future NFL stars.