Zhong kan bu zhong yong... 
haha, in Singapore we only see them, but we rarely use them... this
explains the above perception... seriously, the capabilites of STAR
and PTF have not been really tested...
For STAR, the most dangerous things I see them doing was coming out
in large scale to arrest someone who's armed with a stolen
revolver... comon, that revolver of his could'nt even hurt the STAR
officer given the level of body armor they are wearing, plus armed
with just a revolver, do you dare to resist when a bunch of men in
black charge in with heavy firearms??
... wait till they have to be mobilised to deal with
robbers armed with heavy firearms like the Hong Kong SDU, then
their capabilities are then really proven, till that happens it's
all misuse of manpower 
For PTF, riot control is outta question... this is Singapore leh...
other than that, I think they are
doing fine.... taking part in the tekong search, and doing well for
the security of the IOC meeting... 