it doesn't look bad but it might look cooler with an environment theme to make it more interesting. for example:
- climbing up sides of buildings (to do this you can make indentions in the walls - it makes a cool ladder)
- jumping backward from one side of a building to another
- climbing across the sides of buildings that have water below, like the waterways in venice, italy
- try not to have places in the build where you can see that everything is a facade
also, why are you using someone else's forum avatar? :0