Most things on TI have some specific attack patterns that you can learn and deal with. My main is an ENH shaman too, and while it was tough at first, once I figured out how to fight them it got easier. Turtles are pretty easy kills, just gotta watch out for their spin attack. Don't use your flame or earth shock, save it for the frost shock and when it gets ready to spin slow it and run away. The pink birds are pretty easy also, the only thing you need to avoid is the front cone attack. Just run behind them and keep smacking them. Tigers are pretty easy kills too. Just avoid their pounce by running through them and get behind to avoid their front cone attack.
Also, try to collect the pink stone things, the books of ages, and the dew items. I can't remember what they're all called. The pink stone randomly does 200K+ dmg, the book randomly gives you 8000+ to a stat, and the dew will randomly heal you for 60K. Also be sure to get the buffs from the altar, and eat an apple or use a crystal or any of those 5% to all stats buff.
Now that I've got a bunch of purple 496/535 gear I'm just destroying things. Except the damn frogs. I hate those things.