Jason, at Signals vs. Noise, has a great post on project approaches - A Spoon or a Jackhammer?.
Brute force (jackhammer) may get things done, but a whole lot more can go wrong—loudly. Subtlety (spoon) gives you more room to work. More opportunities to say no, to slow down, to make better decisions along the way, to change direction.
The upgrade project I'm on turned into a "jackhammer project" because of the belief that if you throw more resources at it (people and money) it will get done quicker.
The problem with that belief is that certain things require TIME to do correctly. Especially change management. No amount of money or people can change that.