If you dont mind a little editing on my part ... "Is playing a FPS on a PC that much better?" Yes, it is. And always will be.
Also, to the person who posted about wishing they could afford a gaming PC, well "gaming" PCs really arent all that pricey - you could easily have a rig for BRINK for $700 ~ $900 and then you get a machine that can do much much more than just play games on.
PSN was down during the crazy lag. The temp lag fix had already been in the pipeline by the time PSN came back up, so comparing it to what you've seen/heard about the 360 version is just silly.
There's the occasional laggy host (switchers/throttlers/walmartISPs) on PSN just like there is with xboxlive, but the crazy unplayable lag is mostly gone for now.
Go to the "Big Teams" game setting in "Freeplay" and join a few different games.... even that lag that you'll see isn't as bad as the launch lag, reason being that people with horrible connections would tend to avoid the sole 16 player game mode until a permanent patch comes.