I live in the Otaki riding. Yes, I have a local MP with offices in the towm main towns. But I *also* have another MP (list) from the other major party who also operates offices in these two same towns. Plus I have MPs from other parties who advertise that I can call them, too.
I don't have just one MP. I have several to choose from who want to represent me. Because a the end of the day, they want my vote.
Besides, as Dan from More Notes From Underground puts, how is it better under first-past-the-post?
Interestingly, one of the principle critiques of mixed-member proportional representation (MMP) is that the "list" candidates would be entirely beholden to the party. How does that differ from the state of affairs in the House today? On matters that the parties consider important, MPs are not allowed to vote their conscience as it is. A "list" MP could just as easily be booted and find a home in another party or as an independent. Come election time, s/he could attempt to get on another list or stand as an independent. Same difference.