You can't let other peoples work discourage you! You should find what makes their projects awesome and be inspired! <img src="smileys/smiley16.gif" border="0" align="middle" />
How much experience have you had with game making? I've been around game making for many years, and I feel very confident on knowing how to make what I need, but I'd still say that my games don't reach an professional standard in comparison to things I've seen being made in Construct 2 by others.
I also draw my own art which I have no real knowledge on how to do it, so most of my stuff looks like something drawn in MSPaint by a 5 year old with a bit of gradient on it :P I just guess and hope and use the techniques I do know and keep on going.
Looking at games such as Loot Pursuit, AirScape, Super Ubi Land, and a bunch of other games on the Arcade, makes me inspired and motivated, as you can see just what sort of stuff is capable of being created in Construct 2 as long as you understand the logic :P
If you're confident, care to share a video or something about your game? Judging by your post, I presume you may not like criticism, which is fair enough if you don't wish to share anything. I think you may be underestimating yourself though!