The only reason to still not rate him now is arrogance and confirmation biasThe number of Spurs fans that still don't rate Lamela is astounding. Thankfully they don't seem to congregate on SC, bar 1 or 2.
Certain people engaged in arguments and whatnot with their stance being that he is shit (or words to that effect) and now rather than admit they judged him too early or that he proved them wrong they'd prefer to seek confirmation for what they believed and maintain their original stance (pointing to any bad game he has or any isolated thing he does wrong to support their opinion and ignoring any time he plays well or does something well.....or at least making excuses to avoid acknowledging the times he does well)
It seems so counter-intuitive to me - as a Spurs fan surely you should be happy to be proven wrong when writing a player off as it is for the best of the team you support. Unfortunately some people are so arrogant that they'd rather be right in a pointless argument at the detriment of their team than to "lose" the argument or proved wrong