Personally, I think you just had a bad experience, and should give it another shot. I was blown away at the quality difference over the typical way I brew, as well as the grain to glass in 6-7 days.
I would really consider hooking up to the liquid out line, but turn your CO2 way up to make sure there isn't any back flow...hook it up for half a second to blow the tube out, let the keg settle for an hour, then transfer again.
I've been using wyeast 1056, and have had no troubles, other than krausen blowing out of my valve.
My first experience with the valve was touchy...had to clean it several times during the first three days until I put a catcher inline...effectively a mini keg to catch the krausen before it hits the spunding valve.
Here's how mine went:
-Sunday I brewed and pitched.
-Monday the valve started hissing. disconnected gas line and shook keg twice a day.
-Thursday it died down. Disconnected gas line, shook the keg one last time, turned up the spunding valve to 25-30psi, reconnected gas fitting.
-Friday gauge was reading 24-25psi.
-Friday night transferred to secondary keg at 25psi, then cold crashed (next time will cold crash the primary before transferring).
-Saturday tested beer, and it was delicious...naturally carbonated and ready for consumption....in my opinion.
-Sunday, beer was ready for sure and very good.
6-7 days, naturally carbonated. never exposed to light or air. quality was much better than with my previous brewing techniques.