Thinking about starting up again

Deathknights I know at one point were damn near unstoppable, if you look back at the most recent tournament you will notice that damn near 90% of all the top teams are Retribution Paladin/Deathknight.

Tanking DK's:
The problem with DK tank's is that they are built for avoidance. Which is fine, but they take tremendous spike damage with no real way to mitigate it. They have their armor of course, but being able to block attacks is invaluable. We have a DK MT (maintank) in our guild, and he spikes pretty hard. I prefer something other then that, however they are very fun to AoE tank with.

Dps DK's:
A good DK can easily pull 8,000 dps in 10's. I knew one who could do it in 5 man's but they are very few and far between. The hardest thing about them is managing your Runes/Runic Power/Rotation. Master that and you are set.

PvP DK's:
While I was going through a PvP phase I had my dk run around with nothing but gloves, and scored the highest honor multiple times. I would play the annoyance and just run around chains of ice'ing people (spammable, with set bonus). When I switched to trying, I had my tank gear on. I could get jumped by six guys and be alright. Popping cooldowns makes you damn near invincible in pvp. They are a lot of fun. Also, the selfheal makes 1v1 fights fun.