If you have any friends and they are currently playing a game, you can watch them. Also, of you want to see matches of regular players, go to members, select the rating range (pick something low like 1800-2000 as higher rating means more titled players). Also, select online members. If the person is playing, you can watch his game.
How to watch regular members?

The issue is still that I cannot find any members that are playing. In the past I could hit "newest members" and I'd get a list where at least a few were playing. Now, in members, I have to pick the type of game and then I can add in Min to Max level. But, you only get a few players and then the list turns into titled players, and again, with the small list of, say 400-1400, no one is usually playing. Maybe because I'm on the free account.
I used to find people playing, I think in "Members", to get an idea on how low ranking people play. I can't watch any good players as they are way too fast. I like to watch the slow players because I can think through what my move/strat might be. It looks like I can only watch titled and high ranking players now. Is that feature not available any longer?