I was just cleaning out my fabric closets and found 9 blocks that I made at a BOM at my local quilt store. I did what you are thinking of doing. Quit because everyone else made fancier or prettier blocks than I did. I started the BOM just to learn techniques. Well I am going to finish this quilt now. The blocks are a lot better than I remembered. At the time I didn't spend much, a lot of vintage looking fabric. These blocks look like something my grandmother would have made. I got them out and they are really pretty. My husband wants me to finish the quilt for our bed.
I guess what I am trying to say is don't quit. Even if your blocks are not perfect you are learning. I bet when you put them together they will be beautiful.