For being the largest playing card forum on the internet, there is no board for card games!
If you google "card games forum", you'll only find dedicated deck or collectible card games!
The closest thing to a games forum is this: https://groups.google.com/forum/#!forum/rec.games.playing-cards which sees very few serious posts but has some IPCS members posting like Depaulis, Parlett, and McCleod. The only other option is wading through the many loosely connected sections of http://boardgamegeek.com/boardgamefamily/98/traditional-card-games
Actually I think there's quite a few places on boardgamegeek.com that would offer what you're describing. It is after all the world's biggest website for card games and board games, with over 4 million unique users monthly. I've been active there since 2005, and regularly post reviews of board games and card games there. Here are a few options to consider:
1.
Family page for "Traditional Card Games". This is the link you mentioned already. This has links to individual card games that each have their own forums. If you scroll down, this page also has its own forum, although there are hardly any discussion threads there. This page is mostly useful to help find database pages for individual card games.
https://boardgamegeek.com/boardgamefamily/98/traditional-card-games2.
Database page for "Traditional Card Games". This has a more active forum about games played with a traditional deck of cards.
https://boardgamegeek.com/boardgame/21804/traditional-card-games3.
Playing Card Games Enthusiasts Guild. The forum here also has discussion about invented and existing card games, all played with a traditional deck of cards.
https://boardgamegeek.com/guild/12594.
GeekLists. People often post helpful GeekLists about different card games, and other users then comment on the individual entries on the list. As an example, here's a list that I created about my favourite games, entitled "Favorite Games with Standard Playing Cards"; there are many others like this:
https://boardgamegeek.com/geeklist/171804/favorite-games-standard-playing-cardsSo I think boardgamegeek.com is the website which has what you're looking for, it's just a bit of an intimidating labyrinth for newcomers, so hopefully those links will be helpful pointers in the right direction.