Guild Wars 2

Mainly for WvW (medium sized groups and zergs).
And something with a decent mobility.

I’ll appreciate any suggestions.

I’m no expert, but here’s my advice: In WvW I always run a staff, for area denial and AoE damage (get ALL the loot bags :P).
Here’s a link: http://gw2skills.net/editor/?vEAQFA2mMISdD2yACASBUCPIghCEFsooYnZA
I use 30 in fire to keep my fire fields lasting longer, for area denial. All the other traits are there to increase my damage, because I can normally stay far enough from the enemy to always stay alive.
Healing skill can also be ether renewal, but arcane brilliance gives more utility (blast air 5 for swiftness, fire fields for might and water fields for healing).
Signet of air increases your mobility and is the shortest-cooldown stunbreak, so i take that.
Arcane wave is there for the same reasons as arcane brilliance.
Your last utility slot can be:
-frost bow for more damage (skill No 4, then 3, 2, drop( or keep spamming 1 for healing))
-Glyph of storms ofers some great AoE damage and utility.
-any of the other skills are also fine as you see fit (for example signet of fire for even more damage on Meteor Shower)

Elite:
-fiery greatsword for incredible mobility
-tornado for combo with Meteor Shower.

I hope you found this helpful!