Yes, lazyrider tanks marvelously, specially 5-mans. My best CCs are Deathstrike (Blood DK), and Truman's Warrior (Prot warrior). THose works marvelously.
But default DK (singluar) is very good too, can be used to tank 5-mans easily.
You should, however, use some pulling, such as charge, intercept, death grip, and sometimes silence to get some ranged.