MRO has a max resolvable resolution of 1 meter - incredibly useful for planning, but not enough to keep a rover safe from harm, let alone do all possible science.
The max resolution from a low-altitude helicopter is probably two-three orders of magnitude more detailed
What's the alternative? As a Digg v4 refugee, I've always wondered.
Trouble is that deep knowledge of niche communities has taken 15 years - a not-insignificant portion of a lifetime - to accumulate. If the site dies, so much specialised discussion is scattered where it'll be far harder to find.
Still can't believe we've got proof of Marsquakes - that alone turned the consensus on planetary geology upside down.