User blog comment:YourPrivateNightmare/Ewwwww, it's got the nerfs!/@comment-6486964-20140512043904/@comment-24613667-20140512112714

The isolation range increase was, sadly, the most reasonable nerf that Riot has given Kha'Zix lately, though it's now fairly hard to proc unless someone is literally just alone in the jungle. But, of course, this change still won't fix him and people will cry sum moar. Sooner or later, they'll nerf him to the point where his only remaining strong points are his actual strong points: isolation damage and evolved Q's missing health damage (which is where all of his power lies). The players who actually like Kha'Zix realize this and that's why they continue to play him well and romp faces.

Seriously, dealing a fully-stacked Bloodthirster and two B.F. Swords worth of damage on an isolated target at level 18 with  bonus damage , not even counting the auto-attack (think about that for a second)...is ridiculously strong. Oh, and you can get that bonus damage back instantly by walking into a bush or popping your ult. On top of that, add a 3.5 second, 25 mana cost, 150%/217.5% bonus AD-scaling, 6%-8.7% missing health damage, 375-range, targeted spell and...well, does anything else really need to be said?

So, to conclude and mention a champion only brought up by the OP, I'll continue to nom people as my two favorite bugs, Kha'Zix and Elise, through their nerfs because I understand how to play them well.