I enjoyed watching this show. It is a dramedy which works very well, with just the right balance of laughs and drama. The acting was first class, in particular the three main characters who work very well together. I have read the books that the series was based on and know that the series would have had some serious legs if it had been given the green light for a second season.
To criticise, I would say that the characters are billed as paramedics when in fact they are emergency medical technicians. I work as an EMT and feel I can give a good rounded opinion. Some of the things these guys get up to just wouldnt happen BUT it is a comedy/drama series and events have to be exaggerated for dramatic purposes, which is what happens.
What the show does very well is portray with some degree of realism the world weary emergency medic. This is well worth watching. I believe Dennis Leary is looking at making a US version which may be of interest to fans. I hope his version gets moe than one season if it's as good as this.