For the appreciation to be genuine, it has to be on the players' actual merits. Saying Sampras will always be the greatest player of all time means, by definition, you will never be able to appreciate anybody greater - precisely the player most deserving of appreciation.
Wow, you really don't understand the concept of being a loyal fan, do you?
Do you have children? Do you think they're the best? yes? well that's because they're yours.
It's emotional and objective, but mostly emotional.
And just for you, yes you are right. All of us that have personal faves are dumb, we're not open minded, we don't appreciate the game and the players, whatever it is you want, you got it.
Just cut the crap and lighten up.