There are many to choose from. Often, it seems that becoming a sports journalist or broadcaster is what you do if you can't do anything else in journalism.
My least favourite, of those who are reasonably well-know, are:
Alan Green - Loudmouth, opinionated, unthinking, etc. Being opinionated might be a good thing except Green's opinions are almost always negative and unhelpful. He seems happiest just having a go at someone: Players, administrators, referrees, supporters. He casts himself as a "voice of the people" but whenever a journalist casts himself in that way it is certain that he views the public as midless gobshites and that is the audience he is pandering to. Also, he is a very, very poor commentator. Radio commentary requires description of action, it's a difficult skill, a skill that is absent from Green.
Mihir Bose - What an oxygen thief. He should be working as a columnist in Heat magazine discussing Big Brother or following Britney Spears around. He is the antithesis of being a journalist. Investigation, acquiring facts and compiling a report are not in Bose's skills list. He merely trawls the websites of the world picking up unsubstantiated gossip and then regurgitating it in newspapaers and on the BBC website. (Have people seen his "article's" on the BBC website? They are bedecked with phrases like "my source said", "I have been told by someone", etc.) And, his gossip-filled articles are so vacuous that I fall asleep reading them.
Garth Crooks - What is Garth Crooks? What is he? Why is he? Is it a joke that I don't get? Will he reveal all one day saying "aha, I fooled you"? He is vacant, a blank canvas, a lack, an absence...there's nothing there, no-one is at home, Captain Kirk has a five-year mission to discover life, in Garth Crook's brain.