The oblique kick is a dangerous move as it is basically a side thrust kick to the knee of an opponent. If done properly in a real fight, (as in a scrap in the parking lot), the oblique kick can and will snap your opponent's knee and/or hyper-extend it way beyond normal range in the opposite direction it's intended to go. It could cause significant damage to the knee and leg of a fighter causing them to be out of action for months or a year + depending on damages done. So it that sense Rampage has a legitimate grip, that being said the main issue with this kick is the range at which it is used. Too close to opponent it is hard to use it, too far away it don't work well and is more of an annoyance than a threat, but in mid range it's something to be feared in the octagon. However there is a checking technique an opponent can use to counter the oblique kick and is something all fighters should practice. By raising the knee so that your foot barely raises above the floor/mat one can effectively counter this kick, in essence the oblique kick, when countered in this method, is little more than a slap/push against your leg and has little effect or use.