Yeah I have no idea what they were going for there. I think I wound up watching everything of both series that made it to Jetstream. MAR was a super-generic tournament shounen that wound up being entertaining largely thanks to its surprisingly-good dub. Hearing Spike Spencer as an ultra-cheerful plucky shounen protagonist was an amusing change of pace. Prince of Tennis frequently frustrated me because I actually played the sport, and at the end of the day it was largely fangirl bait, but I swear the coach of the team was a dead ringer for my high school coach, so that was amusing at least.