Opinions! We all have them. And we're repeatedly taught that they're all equally valid. It's a heartwarming bit of utilitarian thinking.
It's clearly b*llocks though, isn't it? We all know people going around making ludicrous claims like that the N64 controller wasn't brilliant, that Crash Team Racing is superior to Mario Kart, or that a Rich Tea is a perfectly palatable biscuit.
(It's not, and the only reason anybody has them in stock is to serve them to company. Save the proper biscuits for yourself.)
There are some things that are almost universally agreed upon—although that's increasingly impossible in the internet age. Opinions within gaming circles are rarely anything less than vociferous and hotly contested, but even in this veritable minefield, there's a certain selection of 'untouchable' titles which we all generally accept are bona-fide classics.