There are a lot of Canuck fans that need to eat a bit of crow WRT to opinions of Dermott in all of the Miller and/or Schenn trade threads. Leafs fans were not wrong when they told you he had a bit of value, and might be a decent fit for Vancouver who'd obviously like to get a bit younger; without going full-blown rebuild.
That being said, he is of course a guy who will likely benefit from the change of scenery, and may yet still blossom into a quality top 4 defenceman.
Overall, you definitely have to like the series of moves the Canucks made today... swapping 3rd rounders (which I guess is kind of irrelevant considering they and Winnipeg have identical winning percentages), but shedding $1.5m on the cap, getting younger, a much "hungrier" player, and some upside as well.