Shyvana has a horrible build path right now
For a champion that was given the Sejuani treatment with Devourer (40 AD twin bite, ugh), her most popular build path (and most successful) involves bloodrazor, titanic and straight tank. With the nerfs to Titanic and the general crappy feeling it is to try to fight anybody with just bloodrazor, her ability to be a moderate damage dealing juggernaut isn't reaching its potential. You simply have to buy too many things (tenacity, tankiness, AS, AD, an item with a cc ability active) to succeed making her never really hit any power points throughout the game. She has no identity right now other than a champion that is slightly below average at everything other than clearing jungle camps.
Some junglers are early game monsters that put a lot of pressure on the enemy team, and others are slow to start late game monsters that need to be shut down early so they can't dominate. Is
either of these? I don't think she is. Now Riot has already responded on the boards saying they aren't going to look at her anytime soon so I assume the best we can hope for is a buff to BOTRK which is the only item that provides AD, AS and that necessary active for her, making her somewhat of a mid game champ that can succeed after purchasing this in addition to a tanky item like Randuins. This would also give her a small amount of sustain to make playing her top lane at least somewhat viable again.
http://pre12.deviantart.net/a547/th/pre/i/2014/205/f/6/shyvana_by_rin_t-d7s2zcl.jpg