Cutting content?
Only things they cut were the ancient falmer helm and castle upgrades which they really didnt since fort dawnguard upgrades little by little when you do the quests and Castle Volkihar, you can open the path to the garden, can't really do much to fix up a fancy castle which already looks better than all the other player homes.
They gave us everything they promised, people ASSUMED werebear and spears and what not were gonna come with it.
I would hold back on assuming they didn't cut anything out either. There is pleanty cut out of Skyrim itself, until we get the PC version there is no way to know for sure. But there already is:
The reaper
The crown
The unfinished castle upgrades
The unused verlet they added in the DLC1 patch
Cut content is almost always inevitable with any game, DLC is no different. Though that doesn't mean Dawngaurd is lacking anything either. There is plenty to do and see.