Jenkins was the Falcons' 2004 first round draft pick from Ohio State, and has played the last two season with the Vikings. He has averaged around 14 games, 39 recs (56% catch rate), 492 yards, 3 TDs per season. Basically, third WR numbers. At 6'4" 214 lbs, the Patriots are looking to use him as competition for the split end spot, although he has experience in the slot in Minnesota as well. Adam Caplan calls him, "...one of the [NFL's] better blocking WR's".
Coming out of college, he ran a 4.45 40 at his pro day, but it has been noted than his speed has declined during his career. He had a 34" vertical, a 6.93 3-cone drill, and a 10'6" broad jump.
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He's at his best finding space against zone coverages, and tries to win in man-to-man coverage with his post up skills and leverage from his size. He is not an elite change-of-direction athlete and not a major threat in the open field. He has reliable hands and very good size (the Patriots have a need for size at the receiver spot), but the feeling here is that he's just a role player in this offense if he makes the roster.
While he may be nothing more than camp competition (the guy is 30 years old and has had a 9 year career), he could also help us near the sidelines (around the 10 yard mark), and as another tall endzone target. As a situational receiver such as against short CBs and heavy zone teams, he could help us out if he makes it through training camp.