Before we moved here, my wife's ex-coworker is actually Ethiopian, so we have actually tasted what she considered to be really good and authentic Ethiopian food at the best restaurant in town.
Fassil is pretty darned close to that gold standard (which is unfortunately not in Canada). We've tried another one in Vancouver before, and it's not close to being as good. It's hard to describe what Ethiopian food is like. Some of the flavours are familiar, yet at the same time, there is nothing quite like it.
It's eaten with your hands along with the spongy, sour bread. Be warned, it can be VERY spicy!
If you've never tried Ethiopian food before, Fassil is a great place to start. If you like Ethiopian food, well, Fassil is a good place to go back to. Service was friendly, not quick but not slow.
I've noticed a lot more Ethiopian places opening up here, so maybe Fassil's crown won't last long. It's tough to give it 4 stars, since I think we've had better. But the bottom line is, it's worth a return trip.