Chuckle, feral druids are viable over all sorts of content.

To say that we're equivalent to our parent classes though, isn't accurate.

A good rogue with equivalent gear will out dps us while in kitty form.  Period.  Regardless of talent build (a few poison immune, but bleed affected mobs maybe excepted).  D3, T4, T5 equivalent gear this is completely true.

A good warrior with equivalent gear (both full tank gear on a boss, bears in dps gear not counted as it's loopy silly tps on trash for sure) will generate more threat per second than we do in bear form.  Also pretty much gospel.

That said however, druids are solid over pretty much all content I've encountered.  Additionally, we don't take un-healable amounts of damage in bear form while in dps gear (beauty for off tanking and multi-role fights) whereas prot warriors in dps gear are, well, not so good.  To boot, LOTP should never be written off for other melee classes.  Chance to crit is huge both for feral druids and many rogues, and you'll almost always wind up in the rogue group regardless of what your role in the raid happens to be.

All completely off the original topic though.

Waste walker is a good set both for kitty druids and for rogues.  The gloves are great for bear tanks too, especially after you start approaching the phys damage reduction cap (pretty easy in T4 gear and buffs with 2.1, and frankly dodge is king), and +hit is never to be completely ignored for either kitties or bears.  Bears typically would benefit more from heavy clefthoof in general than wastewalker if MTing an instance or raid, but OT / shift to cat where appropriate (or shifting into bear when things go horribly sideways) WW is a phenomenally balanced set for feral druids.

This set is not trivial to obtain (I've run more heroics than just about anyone I know, 40 badges left after all heal + FR + tank + feral dps gear purchased) as I've only seen gloves (on regular) and legs drop, but it's good gear and congrats if you do get it.