As the cat has everybody elses tongue, I'll step into the breach :-)

Isn't wing chun particular amongst martial arts for the style in
which a fowm is performed? Tae kwon do/karate have snappy sharp
patterns designed to show speed, flexibility and power. Aikido/jui
jitsu etc etc don't have them...and other chinese arts either go for
the speed/flexibility route ( wushu/shaolin ) or the 'honest, this
does have combat applications if you know how it works ' ( guess who
was never any good at tai chi.... :-) )
All tae kwon do forms have the same 'feel' i.e. snappy, crisp, full
of power and performed against imaginary opponents. Each wing chun
form seems to have a different flavour. Perhaps it is my inexperience
and when I become more adept these differences will blend into each
other. Having seen a little into the depths of the system however,
I'm more inclined to believe that whoever brought this system of
movements together had a quite breathtaking understanding of human
mechanics and physiology. WC forms seem to be more of a textbook of
human anatomy during the process of combat, rather than a rehersal of
combat itself. It's always best to go through a textbook slowly.
Rich
feeling wordy :-)