Looking back, you can't really dispute, nor substanciate the claim that he's 'amongst the best strikers in the PL'. He's had one full season in which 13 goals and 3 assists in 23 starts tells a pretty promising story. It certainly suggests that he's a league above your assessment.
I must say, I've been wrong about Carroll before, but you're bang out of order calling folk 'idiots' for rating a player so highly after such a good season, as you've no real arguement to counter their opinion.