Your experience just about sums up Acer Media Centers for me - I bought one of the original Acer L250 "Living Center" machines several years ago for a customer. The first one couldn't hold a stable picture on a monitor, nor provide clean sound without distortion, and after much effort of getting it returned and replaced by the internet store it was bought from, the replacement had a hybrid tuner that could only find a few DVB-T channels on an aerial that other Media Centers could find all of the channels, and when run in analogue mode, stuttered every few seconds.
When Acer brought out their latest small form factor Media Center PCs, I bought one to use as a small demo machine (the L3600 I think it was called). This machine, despite coming with hybrid DVB-T/analogue tuner and having the words "IR Blaster" silkscreened on the back, had no IR blaster cable or socket to plug one into! I didn't notice this until after I'd set it up and got to the point that said "now plug in the IR blaster"... I carried on and set it up with a Microsoft IR instead, but the machine crashed so often I sent it back.
I'll never buy another one.
Cheers,
Andrew