2 comps
5s Melee Cleave
The default competitive 5s archetype: stacked melee burst (warrior + rogue) behind two or three healers. 5s in TBC is less rigid than 2s/3s — think in team archetypes, and melee cleave is the highest-floor one.
Cleave
5s Double-Healer Control
The attrition archetype: a healer-heavy core with a warrior + mage for pressure and CC. You almost never lose a teammate first and grind the enemy out — but you need a real kill condition to close, not just survive.
Sustain