Many people say DK's are too good, but they can't really say what's so good about them. It's everything, they do too much dmg and wear plate and can cc and silence and other nasty stuff. Well, there are some very obvious things that make DK's way better than other class. Whereas most classes have drawbacks to skills (i.e cd's, casting times and such) most of DK's skills lack these.
To illustrate my example, let's compare two skills that resemble eachother; Battle Shout and Horn of Winter. Now they do about the same thing - BS gives (untalented) 548 ap and lasts 2 min, HoW gives 155 str/agi for 2 min. So one could first of all argue, which is best? AP or str/agi. Although 155 str/agi is less ap it still affects other things, like crit/block/parry etc... In any case, no one would say BS is definitely better than HoW.
Yet BS costs 10 rage and HoW gives 20 runic power. This means HoW is purely beneficial, and has no drawbacks whatsoever.
And this illustrates the difference between DK's and every other class beautifully imo.
I might figure out more examples later.