Guild Wars.

[roguebanshee]

Rarely does that ever work. The meleers ALWAYS split, half going after the Warrior, half after the Healer, or god forbid the Mage. Ranged attackers likewise always go for the Healer or Mage. I'm constantly having to babysit them all, but I can live with that. What kills me is when they rush headlong into a battle and drag half a dozen extra mobs into the fray. :P Running up close + Lava Font is a good tactic, but costly in mana and time. Firestorm is ok, but positioning is tricky, and it has a long cast time. I like Ignite Arrows + Dual Shot for a lot of AoE damage, but my spells definitely outweigh my bow attacks.
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Try using ctrl-shift-space to call your target once you're close but not yet within aggro range. Stefan (the warrior) should charge ahead and gather most of the aggro first due to proximity. You could also try a different group of henchmen, the holy trinity isn't required in GW.

Most spawns are somewhat static in their location and somewhat predictable. If you see a long stretch with no enemies you should expect an ambush or patrol if you haven't been there before.

My early explorations of post-Searing Ascalon had me fall over in many places due to my lack of experience with my skills, the mobs, pathing, equipment and the Stupid Squad (henchmen). Remember that you're new to the game. Just like in Diablo you'll meet things you can't figure out how to beat the first time around ("Ahh! Fresh meat!") but once you get some more experience the solution will be clear.

If you have a specific location or encounter that gives you problems then try to describe it. Asking for assistance on the guild channel may help too, unfortunately the 4 characters/account limit prevent some of us from teaming without completely overpowering the low end stuff.