Don't sweat the early instances as your gear, talents and abilities are mostly missing. Once you hit the 50s, you'll start getting some of your more bread&butter stuff and enough talents to start making a difference. Dungeons at that level are almost entirely dependent on the class as to whether you can cheese it or wipe repeatedly. :P My hunter group absolutely nuked every instance up through the levels. My mage group was nearly impossible at level until they got to around 40ish. SM was probably the first instance that didn't completely kick their ass.