I really think it depends on where you're coming from in this case. Personally, I think people tend to exaggerate the power requirements of orthos in general, but even in a relative sense the Abyss isn't as hard to drive as something like the HE-5 or HE-6. Also the Abyss isn't as synergistically picky as the HiFiMan orthos, which I think is even more important. Abyss owners seem to be finding a fairly wide range of nice-sounding pairings as a result.
Now, personally I find the Abyss does require a fair amount of gain. As Purrin pointed out (I think elsewhere?) however, some folks conflate gain with power. It's still a consideration though if you're planning on using the Abyss with portable gear. Like, it's not something I'd want to use with most DAP's internal amps for instance (unless it has crazy attenuation room like the DX1000...). I'd say that from the perspective of many portable audio users, the use of a portable amp constitutes hunger. Compared to orthos in general though, the Abyss isn't some crazy hard load.
Also there's always going to be the question of "driving well" and "driving really well." The Abyss does scale up, and with a more powerful amp I find improvements in driver control and articulation. I find it still sounds really great with certain less powerful amps however.
Edited by MuppetFace - 10/28/13 at 5:15am