With all due respect, watching the video is boring as heck compared to shooting them...you NEED to go shoot the matches, of which Iron-Man is the most grueling. In 2011, they tossed a stage before anyone shot and ended up about 850 rounds. In 2012, they ended up about 1200 rounds.
RM3G and BR3G are my two favorties because of the natural terrain and shooting out to 500 to 600 yards with the AR-15. Iron-Man is probably 3rd on my list followed by Ozark. The rest are always maybes for me.
Anyway, grab your stuff and come on out to a local match and see what it is like to shoot instead of watch.