The thought that "If it ain't been fixed, its not broke" is silly. Thats a very bad defense whether your useing it on the sedna heal bug, warping, auto attacks bugs, etc. We all know there are a lot of bugs, glitches, exploits in Demigod. The fact that they haven't been fixed doesn't mean they arn't bugs.
As far as warping, I think it can be an acceptable tactic, say on exile. But its not as big of a deal there. Being able to gank a base as easily as you can on crucible with it, is bad design as JagerJack first pointed out.
But I wouldn't be against warp ability being prohibbited to actual playable boards space. I mean warping itself is a huge advantage. Being able to warp across gaps, is an impossible advantage. I do this all the time with Cloak of Night though, as I'm sure most of us do. I don't do it on Crucible, because I believe its cheap (to the extent of ganking a base that is, I will do it to cross the gaps otherwise). But its hard to say whether its an exploit or bad design.
Well, it would be more accurate to say that if the concept of warping wasn't fully thought about by the devs, and they didnt really think about the advantages being able to warp over gaps would bring, then yes, we are exploiting. But we're only exploiting their lack of foresight, its not an actual bug, or exploitation of a bug. It's exploitation of the warp mechanic.
I personally think that warps should only be used as stated above, only useable on playable "land" on the level, and not able to jump gaps. Even if we are exploiting, in this case, every general can do it with a useful favor item, and every Demigod can do it with a useful purchaseable item. So its not really a completely unfair advantage, though it is an advantage.