Even if the match or the event is exciting I could not watch it without these commentators they add value excitement and information to the matches they are the voice of the match or the events, even if you don't know much about the sports that you're watching you'll get insight and information by just listening to these commentators.
Indeed! Actually, almost every sports league in the world have their own set of commentators, these people are the ones who feeds information to the general public to keep them informed to what was happening in the arena, either you're watching it live on set, television or computer. They are this useful and they keep the scene against boring moments, if we just take some time to hear, sometimes they can also tell some stories just to make the whole event entertained.