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We run the subaru branded 4 pots on both of the rally cars (and so does everyone in the same class) and they are, in my experience, mega brakes.
you likely just need to put decent fluid in (as in, flush the system and replace) and put decent pads in with decent rotors
mcmyk-
Believe the fluid has been changed.
If it were me I would disconnect the battery. Put at least 100kgs better 200kg over the rear suspension (if front wheel drive) to make sure the rear brake bias valve is open and leave the brake pedal wedged with a length wood between the pedal and seat frame and push the seat till the brake can move no more. Then leave for 24 hours.
If that doesn't improve things, rebed in the brake pads, empty dual carriageway and go up to 60/70 mph and stamp on the brakes, not enough to set the abs off but hard enough to put some decent force on the pads and come off the brakes between 10 to 5 mph don't come to a stop, as that could warp the discs by heat being too concentrated.
But that is just me.
lynx
They may look beefy but they aren't performing the way I'd like them to. No track (yet!?!), it's just my evening and weekend 'taking the dog down to the beach' car (⛳).
It's pretty nippy, I'd like to be able to slow down as quickly as I can speed up.