Some of the feedback I've personally heard from others:
- Wishlist is tied to whatever you sync with (you cannot add custom items)
- Filter by feature/property x is missing (e.g. delisted games)
I think both of these can be solved by adding a curator feature. Let people create and share custom lists of gg.deals items. It can be anything: a replacement for your wishlist, a list of EA games, a list of delisted/removed games, a list of retro games, etc. Also, allow deals to be filtered (exclusive or inclusive) of this list.