These are some of the things I always recommend to players leveling Rogue:
1. Keep your weapons updated. Your damage depends heavily on them. Check quest rewards, dungeons, and affordable Auction House upgrades.
2. Don't overuse Stealth.
Stealth is excellent for avoiding enemies and controlling encounters, but entering Stealth before every regular mob can slow your leveling considerably.
3. Use your cooldowns.
Blade Flurry,
Evasion,
Sprint, and
Adrenaline Rush are there to make your leveling easier. Don't save them forever.
4. Use your crowd control.
Gouge,
Sap,
Blind, and
Kidney Shot can turn dangerous encounters into manageable fights.
5. Fight enemies close to your level. Higher-level enemies increase the risk of misses and slower kills. Efficient leveling is about experience gained over time, not defeating the strongest enemy possible.
6. Don't underestimate First Aid. Having bandages available significantly reduces recovery time between fights.
7. Use Vanish intelligently. Escaping an unnecessary death can save far more time than finishing a dangerous pull.
8. Prioritize consistency over perfection. Good weapons, sensible pulls, and active cooldown usage matter more than executing a perfect rotation on every enemy.