When I first read about skill challenges I was like "What an incredible amount of potential this has!!! Now I just need to completely rework how they're doing it."
For many people in the 4e playing community, SCs got the wheels turning, not so much as a finished idea that was teh awesomes but more as a seed that seemed like it could become something amazing.
Rituals were similar, but there was less to build on. The idea that there are spells that are lots more powerful than normal spells but that can't be cast in combat is great. The execution though was... here are some spells? and they cost gold to cast?
Agree on both counts. Isnt 5e taking basically the same approach to rituals? I like to see an option that some rituals as requiring quite particular components or something else.