Trade-in the game toward God of War, which has the one good idea from Lament of Innocence but isn't anywhere as repetitive or dull. Hell, GoW is like Devil May Cry, Ico, Zelda, and Shenmue all mixed into one (the good parts). A couple frustrating puzzle-ish elements near the end, but otherwise it's a highly cinematic, bloody, and fulfilling journey set in ancient Greece. Everything about the game is impressive--for instance, the cinemas and levels employ a mammoth sense of scope (one level is a temple set on the back of a titan, and part of the level shows you walking around the outside -- and you can see his giant arms, legs, and head meandering below). Plus, the main evil dood, Ares, is about 200 feet tall and about as tough to kill as Dracula ever was.
And if you already have God of War, you need to get rid of Lament of Innocence NOW.
Aside: I put off playing God of War for weeks, but between the glowing reviews and my friends pretty much peer-pressuring me into it, I've been sucked lock, stock, and barrel into it. Best PS2 game in the past couple years, easy. Perhaps even best console game overall, although my judgment is cloudy right now. (forgot to mention, the cut scenes are full of bouncy breasts and bloody decapitations and impalements. if you have a weak stomach, well.... run)