TeleFragged have snuck up their review of Quake 4, rating it a superb 90%/100% overall.
"Boss fights in Quake 4 are a mix of full-on shootouts and gimmick fights (where you've got to dodge the bosses' attacks and do something goofy to win instead of just shooting them in the face), and for the most part I'm quite impressed with how these went. And it's always a good move to have really fun boss fights, because more than anything, that's what players will remember about your game. Good work, Raven and id."