I can speak for Vagabonds up to lv 40.
Vagabond was the easiest class iv ever played in terms of pve.
Absurd attack speed with no equips and two sabers equiped.
A buff that can be stacked around 10 times or so that adds attack speed, movement speed and damage. You have to recast the buff every 5-10 seconds or so or you lose your stacks. You get so damn fast and poweful that you melt bosses and nearly any enemy with just x spam.
Huge aoe attack for basic x attacks.
A bunch of grabs that do a lot of damage and can be comboed into and good for starting combos. Most the attacks have a second version if you take off one of your weapons, they will function a bit differently.
Very strong and fast even with base gear.
In pvp Vagabonds do crap damage but you can hit someone a ton of times in very short amounts of time. Miss rate isn't as bad with a Vagabond either due to hitting so fast. If you get a miss, typically you can easily recover and not get screwed over. Comboing as a Vagabond has a ton of options as well. You will have a lot of skills so some will need to be inputs, but they all have potential and can string combo's well when done right.
Vagabonds grabs are versatile and do a lot of damage and some have huge aoes that also do a lot of damage.
You can hit stun the entire universe into extinction. Even if you lack damage, you can infinite combo nearly all dungeon enemies unless they have a shock wave. This is with base speed and damage, so it only gets better.
You have high burst damage.
In terms of negatives...
Without a buff, you're kind of weak but if you have a +7 or beyond weapon this usually wont matter. Also you can just stack your buff and change this.
Rather low hp pool compared to other classes.
Lacks single hit high damage, most damage is burst.
I personally didn't find much bad about Vagabond. In fact I think in pve you have an edge above other classes. Especially if you get a +11 wep or higher... but I never felt the need for a +11, like I did with Female ranger. With Franger, it was +11 or get out.