Some stats from Silva's time at Watford (using figures from BBC article):
Goals conceded/game "pre-approach" (11 games): 1.91
Goals conceded/game "post-approach" (13 games): 1.77
GD pre: -4
GD post: -7
GC/G post-Silva (14 games): 1.43
GD post-Silva: -9
According to my calculations (quickly knocked up in Excel this morning), if Silva had remained in charge and Watford continued in the manner they had "post-approach" (no return to previous form or further decline), then they would have conceded 5 more goals (but scored 6 more), and picked up =<3pts less - finishing 1 place lower (still 5pts clear of the relegation places).
If they continued as they'd averaged up to his sacking (so including pre and post "approach" form) they would have conceded 6 more goals, scored 8 more, and earned the same number of points.
Their win% at the time of his sacking was 29% (36 pre, 23 post). At the end of the season it was 29%.
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(Needed a break from coding php/css at work!)