He was a decent athlete with very clean passing and striking of the ball who never really had the type of ability we're seeing from, say, Barkley now. That's someone who'll be in England's midfield for 10 years. Same as Gerrard, very different type, but he was dominating PL games in his late teens.
In his first full season he was 19 and played 30+ games and scored 6 goals. That's pretty impressive. In Gerard's first full season at the same age he got 1 goal in 29 apps, then 7 the season after. Jenas could have been a top class England CM, but for whatever reason it didn't work out
As I said, he never demonstrated the aptitude to control games like Gerrard did.