Nesneros: Stef is correct. The reason the three metering modes are offered is because they each have their applications.
Spot metering (in my experience) is particularly useful for...
...when you want something small and far away properly exposed, or
...something very specific in a contrasty scene properly exposed, or
...have to determine a difficult average exposure for a contrasty scene.
Center-weighted I find is good for scenes that are generally more evenly lit like overcast days and/or your subject matter will occupy about the middle third to half of what you see in the viewfinder.
I use honeycomb metering for generally all other situations, and even contrasty ones if there is no subject that clearly dominates the picture.
For example, on my 7D:
Register 1 (used for action shots) is set to spot metering.
Register 2 (used for cloudy/overcast day shots) is set to center-weighted.
Register 3 (used for indoor ambient light shots) is set to honeycomb metering.