That depends what the discussion is actually about. Of course they KNOW more than your average fan - they spend their working lives around clubs / press conferences / watching games, etc. BUT - most football chat is simply a matter of opinion, anyway - 'is that player better than this player'...
TalkSport is what it is. Personally I absolutely hate it. The presenters are largely attention-seeking cocks, and the adverts would make me want to drink bleach.
Some people obviously enjoy it, so good luck to them.
What I don't understand (nothing personal) is why you /others would CHOOSE to...