First one that comes to mind is BloodBunny's Lair. In duels, the level plays differently than it did in the past, possibly due to playing styles changing over time, carrotade might also be a factor. The level favors the player with the best defensive capabilties; it's better to defend than to attack. Since the level has 2 cars, this often leads to intentionally letting yourself get hit to hog cars, so it'll be easier to kill your opponent (or by doing crazy stuff). It's possible to prolong matches and frustrate your opponent while never dying.

A while back, those weren't really concerns, and stealing a carrot from your opponent was common. For some reason, that just doesn't work anymore (even in relatively lagless conditions). The level is really only suited for 2vs2s currently. However out of all the levels, this one sticks out the most to me. DW is no longer popular but BBlair has been around since, what, 1999? and still continues to be played.

A truly legendary level.