I'm a bit confused about him. Sure I saw a quote from one of the players about how skillful Sturridge was, saying that he was up there with Robbie, Elano AND PHIL, so that would imply there's more to come.
His pace is also a tricky one - he looks like he's lumbering around slowly but on two or three occasions now he's had a run with the ball and he's had the pace to go with it. Maybe he needs a few yards to get going (after all 100m sprinters don't look very nimble) or could it be his confidence that he's strong enough to hold people off when they catch him? Most strikers without great pace seem to have one eye on the defender, expecting to get caught, and are thinking of the best moment to stop and cut inside (think just about everyone we've bought for the last couple of years!) but he doesn't seem to think this way.
They say the first yard is in the head, and given his general unaware look (how can he be so oblivious about being offside half the time), he may appear slower because his opponent usually gets the yard start.