Well, although I have only played a few games with my deathwing, they are as of right now unbeaten. We usually play 2k points but occasionally 1.5k too. Here's what I'm liking to take...
Grand Master (or force commander or whatever the hell they call him now) 152
terminator armour, stubborn, storm bolter,
auspex, sword of secrets
Terminator Command Squad 265
5 terminators, two assault cannons
Terminator Squad 310
6 terminators, two assault cannons
Terminator Squad 310
6 terminators, two assault cannons
Terminator Squad 320
6 terminators, two cyclone missile (or 2 more
ACs & 2 chainfists)
Dreadnought 143
TL lascannon, smoke/extra armour,
missile launcher (or
CCW & Heavy Flamer)
At 2k points, I add another dread and another 6 man termie squad with 2
ACs. Beyond that, my usual tactics are to keep my force together and concentrate their fire as much as possible. I've found that even though marines get a really good save against my shooting, a 6 man squad putting out 16 shots at 24" is really effective.
Usually (in my experience) a single termie squad can cause enough casualties at that range to make a full marine squad either fall back or become ineffective. At the very least 2 rounds of shooting will reduce a tactical squad to so few men that they have little effect even if they get within their optimal range of 12" or less.
I don't really like deepstriking as it is so unpredictable. However, in one game, it did allow my to force my opponent to split his forces to deal with the threat behind his lines. They didn't arrive until turn 4 though.
In addition, although I own two landraiders (a standard one and a crusader, damn those sponsons!) I've never fielded them in my Deathwing. Really, for the points, I can have almost another 6 man squad with
ACs or a Termie Assault Squad. I HAVE used a Terminator Assault Squad, but since they are so slow, my opponents just avoid them and they rarely make back the points.
I'm looking forward to the new codex and hopefully new models; maybe then I'll field a Libby in place of the Master. Hope I didn't ramble too much...
Deafwing.