Qatar QSuites is the best business class in the world, no?
In any case, if you're flying with Qatar, you're flying with Qatar. It's entirely fair to judge an airline based on any route that they operate under their own name.
It's only the Middle Eastern airlines who treat subcontinent flights as "second class" routes btw, with lesser aircraft, new or low-performing crew, substandard food - and this is entirely because the airline employees that plan these routes are racist. I daresay even on ME-Europe routes South Asian passengers are treated differently by these airlines.