Just rolled a guard
in my opinion, go wvw and follow the zerg train for fun way of leveling
What I found fun about the guardian was that I was able to run into normally very dangerous situations and know that I had the tools (even at low levels) to survive and handle encounters. You have a lot of cool survival skills, as well as a lot of AOE burn which I found really fun to play around with until lvl ~40.
One of my favorite things to do was to go to high mob density areas and get a bunch of aggro. Then greatsword#5 to reel them all in and use my AOE burn in addition to GS#4 field + GS#2 whirlwind. Good times!
Once I hit level ~40, I found that process to be a bit tedious; moreover, it felt like the mobs were getting more skills that interrupted my chains (stun, knockback, etc), so I built a more traditional shout spec affording me cleansing skills (stability, stun breaks, etc) while still maintaining relatively high DPS (all Zerk). This worked well until I hit 80.
All throughout my leveling, I enjoyed the greatsword the most. I recommend that you figure out which weapons you like the most, and then try to set up a high DPS build around those (at least until the higher levels).
Good luck, and make sure you have fun with it. Anyone who tries to push you into an ‘optimal’ leveling spec isn’t necessarily looking for a fun experience.