First of all, pretty much all ninjutsu is a joke. There are no Ninja's anymore - Ninja's were nothing more than assasins from the middle ages in Japan. Nowadays Ninja's wear camo and sneak around with a gun shooting soldiers in war zones, or assasinating politicians in war torn countries. Second, Ninjas were most likely trained in older Ju-Jitsu styles (most of which don't exist anymore, at least not in their earlier forms), Ninjutsu is a modern style meant to prey on people who watch too many Ninja movies...
As for Tai Chi, it's something that takes a lifetime to train. It's truly a complete art - it contains striking, grappling (although the grappling in CMAs is different that say, BJJ - theres alot more standing grappling, small joint manipulation, and emphasis on breaks and joint destruction techniques - not submission), as well as exercises that promote health and well-being. Strait up though, Tai Chi is a great art for fighting - I've got a buddy who's been doing it for 15 years or so - I'd rather step into the ring with a pro MMA fighter than fight this guy on the streets...
The main concern with Tai Chi is finding a decent school - alot of places only teach the forms for health benefit, and don't stress the martial side of the art. If you can find a good teacher however, it's a great martial art.
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