Sure, i'm not calling Slack amazing - but i very clearly said i use slack, love it, pay for it and recommend it. I used Dropbox too.
I don't think anyone here is claiming Slack isn't a massive success. Nor that the product is any less great because it's not innovative. A comment like:
> This time we are saying this after Slack has already established itself. :-]
seems to suggest "we" are somehow wrong.. but i'm not sure where. Is my above statement somehow wrong? Or are you simply linking success and innovation where as i am not?