You'll pretty much be a solo machine. Your flame turret is your "firewall" and your Blade Barrier will be your... Blade Barrier. Prismatic strike and Tactical Detonation are your Greater Commands + dmg. Look up rare artificer scrolls and take those that appeal to you at level, buy and inscribe the rest. You get a free unseen slot for all of your repair spells so go ahead and inscribe them all(again, they do not take up a slot that could otherwise be used for another spell).
Take and/or inscribe all of the Weapon buff types(adamantine, silver, deadly weapons, etc.), this will come in handy, especially at end game when you are relegated to being a buffer mostly.
I fine that an Arti is like a Sorc in reverse. A Sorc starts out pretty crappy but by endgame(and certainly before) it is a force to be reckoned with. The Arti comes out one shot bursting everything on elite from Repeater right out of the box. You'll be able to solo content with ease till mid-to-end game. At end game it's survivable and does some pretty decent damage but it feels less god-like to be certain :P even in Shiradi. Buffing will be your most appreciated skill :P
I know there are Artis that want to throw tomatoes at me right now, but no denying there is a feel of diminishing power returns as one approaches end game from god mode lowbie-land.(this is in reference to the runearm/repeater style, cannot comment on end-game juggalo.. er juggernaut style yet but it looks pretty sweet at end game).
A really nice Runearm I started using this life is
http://ddowiki.com/page/Strinati%27s_Hand_Cannon
Easy and fast to farm(may take an hour or two, depending on how many toons you have, or you may get lucky; took me ransacking on 6 toons :P). Add Masterful Craftsmanship on it and you have a miniture meteor swarm at level 3.