Nothing wrong with old civs.... vanilla is good. Not every civ should be forced to change their strategy to their playstyle.
The world needs a few America, Russia, Poland, Ottoman civs. Germany's probably my least favorite civ flavor-wise. Japan is fine, a small buff would be nice, maybe add a culture aspect to the UA that's more active, but def no need to do any major re-haul.
And yes, I agree on Indonesia. Maybe have it contingent on an early tech, like Calendar, so they can't just settler-expand right off the bat. They would still not be a very powerful civ on most maps, even with 4 luxuries to start (think: Netherlands), but at least they would no longer be just plain bad on non-island maps.