We have seen a FF Crystal Chronicles on every nintendo system since the GC. They are not the greatest games ever made but I've enjoyed all of them(More than the mainline entries actually). 

So what do you think the chances of seing one on Wii U is?

They were something special, especially on the Wii, because of the controller. I can imagine great things with the GamePad. Would buy.

Depends, is Nintendo introducing iOS and Android to the WiiU any time soon??
Hopeful but doubtful I am.

Zero. The previous one bombed despite the huge Wii install base, and I doubt SquareEnix has budget for that...

Never played a Crystal Chronicles Final Fantasy game. Are they actually any good? People I know tend to despise it for some reason

I remember playing the one on the DS with a couple of friends. It was a lot of fun! I would definitely buy another one of these!

Well the game is kinda boring if you play it alone but it's actually really fun with friends! I say give it a try with some friends!

There decent, mainly made for action rpg local multiplayer sessions though. SP was fun enough for me though.

Crystal Bearers was very different though, didnt enjoy it much

Just so you can get an idea of gameplay perspective, all action based real time

I may try it out then. Any recommendations on a specific one?

The DS one! You can play it on the Wii too with your friends. They need to have the DS version though, yes you can play on the wii and them on the DS! The name is Final Fantasy Crystal Chronicles Echoes of Time.