The Gladiator has some great skill chains that can keep him rolling out the damage without pausing to take a breath and these are what you will want to focus on. Additionally, we are always provide cheap Aion Kinah and Aion Gold with fast delivery to player.
In a group the Gladiator works either as a main tank, off tank, or as a bit of extra DPS. If you're playing DPS in a group the only real point of note is watching your AoEs. AoEs tend to be bad in most group circumstances because they will break mezzes and draw agro. In a small casual group, ask your tank if they mind you using them but in structured dungeon runs, leave them alone.
Gladiators make great off tanks.DPS your heart out but when the tank gets into trouble, but be ready to step in to save the day. You can equip your DPS weapon of choice while you play, just keep a sword and shield handy and a hotbar shortcut to quickly switch out your weapons. Also remember to keep a hotbar with your more tank-like skills available for when you need them. Gladiators may not always make better tanks than Templars, but knowing how to tank well is something every Gladiator should know how to do.
Even though it may be tempting to stick with the damage focus that is the nature of this class, it is better to switch to a sword and shield for tanking. a tank it is your job to be the barrier between the mobs and your group, damage is a something you do to keep an enemies attention and should not be your primary goal. Aion Kinah can help you do it easier. Even though most of the Gladiator skills focus on two-handed weapon damage, you do have taunts and Shield Counter that will assist you. Always open with your taunt and use it as it refreshes. Your Shield Counter does some damage as well as smacks down a nice stun and while it may not be as impressive as a fat polearm strike, it does its job quite nicely.
Remember to appropriately position your target for your group companions and keep a close eye on your surroundings and you may find that good tanking skill will overcome any shortfalls that a Gladiator may have as a tanking class.