I'll start off by saying I had no intention of playing a Death Knight immediately but once I saw one I had to play it, and I'm 68 now and haven't logged on any of my toons since. Its so diverse with so many ways to play. I prefer to play with a mainly Frost build with some Blood. I really don't care for Unholy even though that seems to be extremely popular early on.
This is the spec I have as of 68.
This is the spec I intend to use as of 80.
I have a few questions though or things I'd like confirmed, because sometimes I think I know something and I learn something new changing my opinion of a talent or ability.
Frost Strike - Initially I was using it, I liked it, but then once I got Obliterate I stopped using it much, so I respeced at that point to get rid of it. At later levels does it have it's uses? I especially stopped using it once I got Rune Strike.
Howling Blast - I used to use this more but I found better things to spam my Frost Rune on, like Obliterate or Death Strike. The only use I had for this was to use Icy Touch then spread it with Pestilence in an instance, then Howling Blast for the double damage to keep hate. I really have no trouble keeping hate though while tanking instances, so I thought I was wasting a point here.
Acclimation - I don't have this yet but if you checked out my planned build I was going to try this out. Exactly how effective is this? How much resistance does it give you? I figured with Frost Aura giving 80 resistance, and Spell Deflection in the Blood tree I could be a pain in the *** to casters in PvP and hopefully a better tank in instances.
While fighting either grinding or in a PvP fight, I start with an Icy Chill, Plague Strike, two Blood Strikes, Rune Strike when available, Obliterate when other things are on cooldown and I have extra runes I don't need for other things. Then I start over again reapplying the diseases, Death Strike for some curing. I took the 3 Frost Talents to get 130 Runic Power because of the Death Strike glyph, that for every 5 Runic Power you have you do an extra 2% damage and healing with Death Strike.
Anyway, this post is brought to you by a ridiculous long Queue on my server, I've been waiting for 30 minutes and it still says I have 35 to go. Dexter is coming on so I'll go watch that. Let the discussion begin!