I think its down to the lack of retail demo units and the price of the games.
The starting lineup is pretty good but as people have said most of the games are available on other consoles for a cheaper price. While Super Mario looks amazing and is great fun, the £45-50 price tag is a bit steep.
The Wii was the only ninendo console I did not own (I seemed to contemplate buying one every Christmas) so looking forward to zelda and resident evil to tie me over until the next raft of games comes in and the prices drop on the launch titles (ZombiU looks amazing and can't wait to pick that one up).