I think world class should be top 5 in your position for a period of more than 18 months. Which I don't think any of the Arsenal players are.
I'd definitely say that lots are top 5 within their age bracket though considering how young most of the squad is.
Wouldn't say he lets the team down at all but Henry is well known for never scoring in a final and only being exceptional in home games. Henry scored more than double the goals at home than away in the premier league. Great for the Arsenal home fans though, basically guaranteed a goal!