I could tell, yeah. It certainly makes a lot more sense within the context of what it's a spinoff from.
Mahjong itself played no real role in the major plot but the game itself might as well have just been people flipping tiles and making up words for all that could come across to me. As such, I had no idea what they were actually doing or what any of the terminology they used meant. While I appreciate the involved response most of it with the names still flies over my head, so it's probably not worth me going too in-depth on, particularly if I'm not watching more of the show.
They do explain some of the more important terms in the original series. You really should watch that and see if you understand it more after watching a few episodes. It's on crunchyroll.
Those are pretty much my impressions after watching the first episode about a week ago. I kind of felt derp because the show didn't bother explaining Mahjong the way Chihayafuru explained Karuta. I also had a wtf moment again with the bonding montage. The whole episode made me feel like the one person in the group of people who didn't understand a joke and just sort of smiles stupidly wondering what in the world people heard that I didn't.
Once again, Achiga is a spinoff and they didn't entirely design it for new viewers who also know nothing about mahjong, clearly. Maybe they should have, but with their time limitations, they didn't.
Basically though, it's sort of like poker -- each player has a hand of tiles, which make up several suits and then various single tiles not in the suits, and they can play them in certain combinations that make them points. They also can pick tiles off of the wall of tiles in front of another player, or pick up discards. Obviously, in reality the former would be pretty random, but in Saki... not so much, for some characters.
But really, as I said above, you people who haven't watched the original show should solve that problem by going to crunchyroll now and watching it! Saki's there, subbed, and it's great!
Wait.... so why does everyone hate on Angel Beats? I didn't think it was terrible.
They hated on Key first, Angel Beats hate was a natural product of that.
Why so many people here all hate Key so, so much, though... that one I don't understand, no. I know Key isn't for everyone, but the degree of hatred, and near-unanimity of it, are pretty absurd.