Are you just knitting or did you join the first and last stitch. I'm pretty sure you have to join them somehow.
I've never had a problem with the ladders in my socks. Sometimes they seem to show up, but by the time I've knitted a few more rows the gap seems to close up. I've also heard that once you finish the sock and wash it, the stitches will even out and the ladder will disappear. I don't know from personal experience with that one, tho'. Maybe some more expert sock-ster can chime in on the ladder problem.
My problem is the hole at the gusset. No matter where I put that extra stitch, I still get a hole at the top of the gusset. Fortunately, I figure nobody's going to be examining the socks on my feet that closely, so I can live with it until I get better at socks.
That said, maybe you should just forge ahead and see where the experiment takes you .