I think there are alot of people out there who have something against Roger for whatever reason, and try to take things like this too far. So David layed down a few bass tracks to the songs that Roger wrote? Thats like saying half of the live guitar Gilmour performed was done by Snowy White, and Snowy took all the hard parts...Nobody in the band sang on 'Have A Cigar', but that doesnt mean they all suck, just that someone else was the right person for that particular song...

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"I know I'm not gonna sing every note in tune, I know the notes I play on bass will not be perfectly expressed or played in perfect time, but what will happen is I'm gonna be there, really be there, the real me, not something I pretend to be" - Roger Waters