>One question that is critical for the quality (in view of the possibility of vandalism) is: are there manymore sincere contributors than vandals. Apparently the answer is yes.
>
>Mistakes can be corrected, but on the other hand, since there are many contributions by non-experts, any mistake can remain in place for a while.

OTOH, there's the slight difference in the time lag between the discovery of the error and the correction. EB seems to be no faster than M$.