pocket pairs in Stud8

what do you guys think about small-medium pocket pairs in stud8

for ex:

Qh Qd 4h

8c 8d 3s

or

9c 9s Ks

As for 99s,

I think the above 99s hand hand might be playable if I'm up against someone who is very passive and my suit is not showing so I could flush up but what about a hand like:

9c 9s Ah?

For these examples, lets say no one else has a door card matching yours.

Does everyone play them if they are not showing? Would 6s 6c Kc be too weak?