when the player playing the Monster decides to hide and run around the map instead of fighting it becomes annoying and boring but when everything comes together it's crazy fun
If there is a large skill imbalance (or your group just manages to make all the wrong moves when tracking the Monster) you can end up chasing the Monster around and essentially doing nothing for quite awhile. That said, the Monster is supposed to run around the map and evolve before facing the Hunters and/or attacking the objective.
Once the Monster gets to stage 3 you're basically guaranteed a battle at the objective. One of the coolest moments for me so far was when my group was standing on top of the dam, listening to the rain and looking out over the forest trying to spot the Monster that would eventually come for us. Very Jurrasic Park-esque listening to Goliath thunder through the forest below.