That's too bad. I haven't had anymore hard locks of the system since the last major firmware update. Maybe it's the demo?
I've personally never had a single lock, hard, soft or liquid.
I've had my system for a week though, and updated it on a second patch right away though.
Last night went to my friend's place and took my Wii U and some games (and some booze). Had a blast playing Mario U, Wii Party and a few minutes of Rayman Legends (Castle Rock is amazing).
Friends wife played on a gamepad creating blocks by touching on screen for us three. It both helps and hinders, in hilarious ways.
I'll try to organise another night when my Tekken game will arrive.
We've tried to play some Trine with one guy one gamepad and me and other friend with wiimote+nunchucks.
It's kinda a hassle, controls are way too floaty, and graphics while gorgeous doesn't make it easy to see where your character is.