I think it's well written. There's the odd weak joke and some bits are predictible (though still funny) but there's some great dialogue and brilliant one liners. Look how much people are quoting!
Yeah... but the predicatability of the show is funny.. its funny because sometimes you know things are goign to happy... bu the characters are blissfully unaware.
Like in programming.. we must all be polyMorphic... and constantly adapt to our suroundings.
I think the way the lines are delivered are the funniest thing...like when Roy is on the floor after being beaten with a shoe and Moss says " now c'mon roy, it's pretty bad" that was sooooo funny! Yet such a simple line