Shyvana's W (Burnout)
I've played Shyvana since mid season 2, and she was actually the very first champion I purchased. I'm not sure I like the nerf to her W. Riot stated that it was to compensate for her use of the devourer, but I don't even use that item really. I've tried it before, but it just didn't fit with how I play.
With the original one, I've gotten more than 150 magic damage on hit with it the first time I've tried it. But after a while I dumped it as it was too time consuming to build it's damage up. I've also tried the new version, thinking that it's ability to double on hit effects every other hit would be awesome on shyvana. Turns out that the devourer still doesn't fit me well and I just ended up reverting back to my trusted items and saw improvements right off the bat.
To tell the truth Shyvana only needs a jungling item until late game about 30 mins in at most. After that it's better to switch it out for another item. I don't even upgrade my jungle item with an enchant. I just leave it at the stage it gives me a better smite. Then after I've filled out the other five inventory slots with full built items, I sell it and get another item.
I guess what I'm saying is that the devourer really isn't going to make Shyvana OP or underpowered, it's just another item to have.
I think if Riot really wants to balance Shyvana right, they need to deeply analyze her kit and compare it to the newer champions whom have kits which make hers look old as f*ck.
And I'm still annoyed by their decision to remove her armor shred simply because they couldn't find a way to fix the bug in it.