So I'm up an running fully now.
a.) online banking is working (internet explorer 7 mode)
b.) 3D security is working
c.) Payment via their online banking taken from my visa debit card and credited (to avoid the hassle of transferring from my bank).
d.) Card works fine in use (since I registered for online banking)
Yes the online banking is bad but if you look at avantcard.es you can see that once it's fully deployed it will have all that one needs. Still better than Tesco's non existing online banking ;-)
Let's see how this develops, I agree that it should not have been this bad, but they are making progress and I quite like card because of the high limit (I travel a lot and that pay back immediately) and the looks of it (it looks nicer than the new ICE card version which is plain PTSB).