you don't see the real value because you are a beginner. This lens is meant for creative photographers who can think of depth, perspective, composition and intelligent framing.
Those 2 photos you posted are snapshot and can be easily taken using an iphone.
even though this was put rather rudely, I have to agree on some level. (although I think "learncanon" needs to learn a little tact)
an UWA is a special lens and from the examples you posted, it looks like a 24-70 might've been more up your alley...or at least a standard zoom. the distortion is something you can learn to play with. sounds to me like you purchased the lens without really knowing what you wanted from it.