I played a few ladder games many years ago, but competitive RTS just isn't my cup of tea. Too stressful, I can't focus on everything at once and I tend to micro/macro badly. All of these things would be solved with practice but I haven't taken the time to do it yet, so for now I either play against the AI or watch ladder replays, and realise that I don't suck that bad. Not so long ago I saw a 800 guy stalling on mass before he even finished his first mex, started three mexes and a factory at once, and waited like 30 seconds before realising he should send an engie to reclaim the 75+ wrecks by his base, then proceeded to cancel everything but his second factory and stall again.
So yeah, if I'm going to get this kind of opponent I might just give it a try, but chances are I'd become that very guy if I get too anxious. Over a game, yes.