Question About Expanding (Exploding) Block
 

I saw a video on line demonstrating this block and it looked interesting. I've tried it and it's fun and easy, but doesn't seem too accurate. It seems...messy. My question is, I'm new to quilting and still struggle with accuracy, so is it the block, or me? Has anyone else tried this block, and what was your experience?

I watched the video and the method is not very precise. I'm not sure how you
end up with a nice looking quilt like that. It would drive me crazy for sure.
I'd probably poke a few holes in my fabric. LOL
May I suggest you use a different method such as in the video below.
I would also recommend that you starch your fabric before cutting
because you will be sewing on bias edges which tends to stretch.
Check other tutorials through google. It's called Economy Patch quilt block.
https://www.youtube.com/watch?v=Ow_zVqQ-7yc

I just watched the video myself. And I agree with you. It's messy. The points are super cut off.

Some quick piecing techniques are like that. They just don't turn out perfectly. And it's not you, it's them.

But the nice thing about this quilt and about quilts in general is that when you step back, you really don't really see it. Looking at the quilt prior to her piecing, I did not notice the cut off points at all.

I personally would prefer to do a well-done square in a square quilt. It would be a good use of scraps too. And the result would be the same as far as creating that shimmery exploding look. But if you just want to sew and have fun, it might be a fun technique to play with, especially with pre-cuts, since it's sometimes hard to figure out what to do with them.