TOKYO POP PLAYA
I have another question, Does the PS3 run good wifi online?
Yes and no.
The games I've played online using WiFi have been great! PS2 and the Lost Planet Demo.
Tekken 5 is a different bag of beans!
Because Tekken 5 DR Online has no dedicated servers it does a P2P kinda thing, so your NAT HAS TO BE either 2 or 1 *If it's 1 it means your directly plugged in, and you're not using WiFi*.
If your NAT is 3 *like mine* then you will have Lag, hard time staying in rooms, getting kicked out, etc. So you'll need to do some Port Forwarding *which I'm still having trouble with*.
http://sdtekken.com/t5dr/online/setup-guide/
Follow that guide.