I probably should've specified mandos in recreational play...of course in a tournament you have to respect and abide by the rules, but I just don't get playing a mando during a round with your buddies unless it's there for safety reasons...a lot of times it's just the designer saying, "This is how I want you to throw, don't get creative, don't find a way to deuce this hole if you can't deuce it on this route."
What courses are you talking about? Every mando I've seen is for safety reasons to either protect other areas of the park like trails, pic-nic tables, etc. or to protect other disc golfers from fairways intersecting, tee boxes being thrown over, etc... But yeah, it'd suck to play on a course that is mando-this and mando-that for no apparent reason. One of the great things about disc golf is finding new lines and I love holes where everyone in the group ends up taking a different line.