For example in voobly you could see the good way,
In DE:
First dont show all the games that are being played. (I need see in aoe2.net and copy paste the code of game.
Second The only games that appear I need to select for see the rated, even there late much time in appear.
Third If two players or more watch the same game dont is allow do coments, in voobly is a good way to get feedback and learn more.
My idea is that the spectate Mode could show all the matches, you can sort the games about rated and you can do coments when you see the match with others People, If you dont want see coments only write !mute