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Warriors are a pretty black and white when it comes to what they can do. From lvl's 1-10 you need no group unless you chose to, warriors start off just up close and personal. When you learn charge at lvl 4 it is a good thing to use to stun your opponet and to build rage, when you hit lvl 6 and get the move thunder clap no matter that it is an Area of effect move i do not recomend taking on more then one oppent at a time unless you have to. From lvl's 10-20 i would recomend that you have a sheild and sword so that when you are asked to tank in a group you take less damage. From lvl's 16-20 you should try and run deadmines to lvl a little faster, because every group is looking for a tank. When you finally hit lvl 20 you can learn to duel weild weapons if you choose to duel weild you will do more damage. It is a better idea to be an arms (two handers) warrior to avoid to much damage. 

Personally when I play a warrior, I play with a very reckless style. It also tends to get me the fastest kills and therefore the fastest leveling too. If you do it wrong, though, you will spend all your time dead. I like to take on as many enemies at a time as I safely can. SAFELY is the key term here. When you're up against enemies a couple levels lower than you and you have pretty good armor, you will actually kill them faster by pulling more enemies into the fray. You do more damage the more damage you take, so throw knives at nearby enemies to get them beating on you. I rip each one so they're all bleeding slowly as I focus my power on one of them. Just be careful not to pull too many enemies. This is a VERY reckless method so don't try it unless you know what you're doing.