Do things still sound bad after running Audyssey? It shouldn't sound WORSE with a center channel, but it will sound different.
Also, is this with all content? a lot of TV programs (i.e. News, prime time sitcoms) are predominantly dialogue heavy and almost all the content will come out of the center channel. Coming from a stereo setup where the sound was distributed by necessity to two, stereo speakers, these programs can definitely take some adjustment time to get used to the new central focus.
So don't make judgements off TV shows. The real test is a well-mixed movie soundtrack, so after Audyssey calibration you should pop in a flick and sit back (maybe crack a beer as SoM would suggest
) and see how it sounds....
Looking at that picture the acoustics (position and also being inside an enclosed shelf space) are playing a large part in the sound. If at all possible the center should be as far forward as possible (so the upward dispersion of the tweeter is not being blocked by the shelf above it) and tilted up slightly towards ear height.
Here's an experiment: Just as a trial run (maybe when the wife isn't home to complain) try putting that third B&W speaker on top of the shelf, in front of the TV. Re-run Audyssey (maybe just do 3 positions since this is a quick test run) and see if the speakers sounds good together when the positioning factor has been taken out of the equation (using the good ol' beer + movie test protocol).