Pluto was surely going to be interesting. It’s relatively large and in a unique position where methane can change state over the year, but even if it was a completely average Kuiper belt object, we still hadn’t seen any of them yet. But it certainly has proved to be more interesting still, with varied terrain and apparently some kind of activity.
I guess the question really should be how much is there that can be interesting from far away. From space most forests are uniform green, though we know one part is very different from another, with all sorts of unique things and spectacular places.
By the same token, right now exoplanets are just-detectable spheres that are only notable for position, size, temperature, if we are lucky bulk composition or spin. Like shaddack said, if a chemist or geologist could look through the billions of hectares each one has to offer, I can’t imagine there wouldn’t be something to remark on.