What a genuine world class attacking player? I'd say after losing the best player in the world and Tevez he's exactly what we need
Er, who bestowed him with that title? There's no doubting his ability — which is still largely potential — but world class? What exactly would that make Forlan, then? Intergalactic? World class is far too easily thrown around, these days, and in my opinion, Kun Agüero still has some way to go before he can be elevated to a class of player that have generally achieved far more than he currently has.
I certainly wouldn't be unhappy if we signed Agüero, particularly as he can do everything that Tevez can — much of it better — and he also has a far greater range and quality of finishing, as well, but his stature is still very similar to that of Tevez and Rooney, which some believe to be a problem. I don't agree, for what it's worth, but it certainly isn't an argument that we can simply dismiss.
I remember Tim Vickery raving about the 18 year old Agüero when he first appeared in the first team at Independiente, so I've followed his career ever since.
I must say that I'd still prefer that we at least attempted to sign Benzema. Principally because he is very different to both Rooney and Berbatov, and also because there's just something about his technical qualities that suggests that he can go on to be a very special player, indeed. In terms of aesthetic beauty, Benzema wins hands-down, for me. Of course, that isn't the only consideration, but as a United fan, it likely plays more of a role in my own thinking than it does for Sir Alex.
Agüero is potentially world class, and to be fair, so too in Benzema, so it would hardly be a choice between current world class players, but if I had to put money on who is likely to be the better player, there would only be one choice, I'm afraid.