Yeah, that. Don't get me wrong, I fail intervals and hate them, but these were just right. Only just managed the last 30 seconds of the last one: ideal.
I tend to fail the second last one and then boot fuck out of the last one because I'm so mad about failing the second last one. Different strokes, innit.
I like any intervals I can actually get through. As soon as the power requirements or duration is too high then they're "shit intervals".