Serena has the worst form I've ever seen.
Her one dimensional game is technically horrible. She strikes her forehands with authority and it is admitedly a pretty shot. Her backhand, at times, is a great shot as well.. but the girl is rarely in position, takes heiffer steps to the ball, and has the least variety (next to Sharapova) of any player I've seen this decade. Her slice is a complete joke and anything besides a HARD FLAT baseline shot just looks plain awkward.
I know, she wins, but it's intimidation, power and pure fight that gets her through matches and to the top of the game. She is not a raw tennis talent and her skills have completely been honed to be the power (and only power) game taught by Richard Williams.
Oh, and I can't blame her poor tennis form on Richard alone.. Venus has a much more technically sound game and can truly hit some beautiful shots AWAY from the baseline.
I make this post not to hate, but to point out that in order for someone to convince me they're the best of all time, they must have nice strokes to go along with that nice record.