I know stats don't tell the full story but as a 20yr old in an (at best) average league, Suarez managed 10 goals in 27 games (1:2.7), at Groningen 10 in 29.
Only as a 22-23 yr old, playing in an Ajax side that was carving teams apart in Holland did he really up his scoring rate.
My point.... Lukaku is still a kid, but has averaged better than a goal ever 2 games, and will only get better. Any striker that we attempt to buy will be a gamble regardless of age, reputation etc. If we sign him permanently (which I doubt) then I'll be made up to have secured, in my opinion, one of the best young strikers around.