like has been said above,much easier to make good looking welds doing them spot by spot compared to long beads,just a ton of practice required and getting the welder set up right for what you are doing
also about visibility, i have not yet found why or how but it seams like it depends alot on from what angle and distance you are looking at the weld, 99% of the time i dont have any trouble seeing what im doing,then its that 1% of the times when i just cant see any good at all,gues i have just learnt how to work and how to look thru the autohelmet to be able to see without nowing anything about what is right and wrong.