I sometimes wish tanky DKs had to surrender something for defense... but when I meet them in cyrodil, not only shrug they off most attacks, but also hit like the afforementioned trains.
I suppose its an LtP thing, or so I get told all the time.
But hey, even though they easily stomp my poor nightblade archer, I still have fun PvPing sometime, I just contribute from the sidelines and if our side wins a keep, share in the glory a little bit
Whenever you find you can't measure up to the PvP experts, just remember that quantity has a quality of its own, and just assemble a larger warband to go after those keeps and scrolls!