So he's already broken 6.8% of his total promises just 1/8th of the way through his term. That's not good. He's also broken just over half as many promises as he's kept, which I'd say is pretty darned typical of politicians.
Legalizing marijuana is in progress, but I've heard nothing concrete. Unmuzzling scientists and restoring the long form census were both good. Reversing the transparency act was bad. I was most interested in his promises to increase government transparency, but some are reporting it's actually worse [1]. He also promised in an interview with Peter Mansbridge to reduce the concentration of power in the PMO, but he's done nothing about that so far.
We're just an eigth of the way through his term, so the jury is still out in my opinion. He's done some good, some bad, but at this point he's still mostly just a bundle of promises.
[1]http://www.cbc.ca/radio/thehouse/preston-manning-s-prescript...