not getting in the argument of effort or what not, but i think lucasarts doesn't have the worst in-house record.
there was dark forces, jedi knight 1, rogue squadron (according to ign.com it was both factor 5 and lucasarts), shadows of the empire ( i liked it, good in its time ), full throttle, grim fandango, sam and max, and maniac mansion.
also i personally like episode 1 racer on n64.
so it seems to me lucasarts knows how to make a game, its just sometimes they miss. and as of right now republic commando may be a hit.
do or do not there is no try - yoda