Urbies are slow to the point of being embarassing, but in bad terrain (like a city, surprise!) an Urbanmech can hop out from behind cover and deliver surprising amounts of damage- since their armor and engine are so light, most of the Mech's weight is devoted to a massive weapon like a big autocannon (usually). It's a mobile-ish gun turret, so as long as you remember to use it as such- and not like a normal Mech- it can be very useful. Outside of its element, like out in open areas for example, an Urbanmech is more or less disposable- it can't get behind cover or hit a target before it just gets torn apart by long range fire, and can't move enough to make itself a difficult target.
