What is Radio?
Radio is a small part of the electromagnetic spectrum that is used for a wide range of business and non-business purposes as described below.
http://www.ofcom.org.uk/static/archive/ra/topics/wradio/wradio.htm

What is DJ?
A DJ, or disc jockey, is a person who plays musical recordings for a living.One career path for a DJ is to work for a radio station. In this capacity, the DJ is responsible for playing musical selections from a playlist that has been provided by the management of the station. This playlist is developed to reach the target audience of the station. Generally, the target audience is determined by the genre of music the station chooses to play, or vice versa.

Good or Bad Brunei's DJ?? -
Scroll through Brudirect and you'll see plenty of what people dislike about their local radio DJs.
Common gripes? He's too loud and sounds silly... syok sendirinya....he's so capi-capi... kambang and talks too much...she talks over the songs and has an annoying laugh...she shows off in public and is a loudmouth... he only let's his friends call in... she talks with a Malaysian accent... etc, etc.
Hmmmm..whatever happened to constructive criticism?.............................
more about it in here and here