Just one thing to note. Nintendoland is not "the pack in title". The cheapest Wii U set doesn't include anything, and there is also a Zombi U + Pro Controller set which also does not include Nintendoland. So I don't think anybody other than people wanting Nintendoland actually bought it.
As others have also said, there are stock constraints and a few people didn't get their systems in time to buy further software this weekend and there were 2 days of sales vs other formats usual December surge with a full week.
I'm not saying it's a great start, I'm not saying it's a bad start, I just think it's a bit too early to be drawing conclusions either way.
Another thing I've noticed is some retailers (GAME *ahem* are charging £54.99 for some Wii U Software like Zombi U. There's no way you're getting me shelling that out for a game when I've just spent so much on hardware anyway! And as much as you can go elsewhere, remember GAME still hold about 35% marketshare i the UK.
As for us being Nintendo dominated in the UK... LOL! One of the only EU regions where the Xbox outsold the Gamecube and the only market where Xbox 360 is the market leader.
RIP Dad 25/11/51 - 13/12/13. You will be missed but never forgotten.
