Unless you've been looking forward to it a long time (Unlikely since you haven't pre-ordered already) I would recommend just waiting until after you get a chance to try. The Closed Beta will all be wiped, so you can use Open Beta to try it out, then pre-ordering will still get you the early access, and all that without needing to pay for something you aren't sure of.
Of course, I did try it due to IGN giving away free keys and now I wish that I wasn't a teenager with no income and a fairly low chance of owning a computer that could play the game after I go off to college...
Of course, I did try it due to IGN giving away free keys and now I wish that I wasn't a teenager with no income and a fairly low chance of owning a computer that could play the game after I go off to college...