My friends keep deciding to switch servers on me, I'm guessing you do a balance of doing the quest and screnios right ?

1-20 i did questing and scens usually scenarios during the later lvls like 8-11 and 17+, i did pqs for gear starting chp5+

atm im lvl27, i found the best way to lvl was scenarios, with questing on offpeak times.

Fastest way to level is grinding, and scenarios (if you win them). One of my guildies has 2, 40's already. All he does is grind. lol

Not really lvl guide required for this game.
Every quest you take already shows up on the map so you can quest very fast and efficiently.
When you run out of quests for your lvl just go to a other zone and thats all their is to it.

Scenarios are very good to lvl up aswell (if you get a acceptable win ratio). One scenario map awesome for lvl'ing are the small ones (for example the temple in tier 2)

Temple in tier2 is rly sick, i suggest to play Phoenix Gate - very good exp

And, yeah this is true = make quests and join scenario. In 20+ rank you can start thinking about PQ with 2-3 friends. Remember to find good guild. Good guild = exp. Easy.

Fastest way to level is from scenerios.

Tier 1 = Keep doing Nordenwatch.

Tier 2 = Keep doing Mourkain Temple. Stay in the Marshes of Madness warcamp for 2 repeating quests on Mourkain temple for extra exp.

Tier 3 = Keep doing Tor Anroc, stay in Avelorn warcamp for repeating Tor Anroc quests.

AoE groups is fastest way to level, do mobs 2-3 higher lvl in pq areas with lot of mobs, 3aoe 1 tank 2 healers, can do with 2 aoe. and just nuke the crap out of everything moving xp if done right in higher lvls=2,5-5k/minute.
is a guide in bw section at warhammeralliance somewhere

Vouch this, keep signing for scenarios and in the offtime farm Pq's Influence rewards + UNLIMITED mobs,