I said this before on the forums, DK’s phisical reduction from armor went down too much.
I don’t really play alts, but today I was curious so I wanted to see how much physical reduction the armor provides on my 106 ilvl shaman compared to my 132 ilvl DK.
You should take it easy when chatting on a forum.
First, you never disclosed that you are playing your shaman as an elemental or restoration.
Second, both of these specs can very well use an offhand or an intelligence two hander weapon.
Third, death knights rely on self healing rather than shields. They wear plate armor which also gives them a strong passive physical reduction damage.
But you have to keep in mind that a shield offer a noticeable amount of armor.
TL;DR;
Yes this is completely OK. Each class has its strenghts and weaknesses, and DK survivability is not solely based on its armor. It has a lot of life steal and many cooldowns to mitigate incoming damage and not only physical. On top of that DK have great tools to remove controls and prevent them. Using these of course prevents damage that could be inflected on you.