Funny that, my Si brakes were superb! Standard aswell...
I replaced the rear cylinders in the drums, new shoes, new front pads, new front discs, new calipers, and a good bleed of the whole system, and they were fantastic AFTER I bedded them in!
Did you bed your brakes in? If you haven't you may very well have glazed them up.
Also, you don't mention in what way they're bad? Are they spongy? If so that would imply they need bleeding. Had a look in your engine bay for any oddities on the brake servo? That may be shot. More details needed!
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"Ahhhh crap... Just a bit too over eager really!""I used to be an adventurer like you, but then I took an arrow in the knee"