My complaints of communitu are as follows:
Rivers are too plentiful. It makes traversal much slower and greatly favours recon units and civs with river bonuses. Meanwhile Huns are virtually shut down on communitu.
The continent shapes likes to create inland seas, but then it’s not allowed to have inland seas, so it creates maps with extremely artificial-looking 1-tile straits that can stretch 5+ tiles.
The way the map interweaves tundra and snow tiles is ugly and inconvenient. It means useless, no-yields terrain goes much further into central latitudes.
The civs are, to the best of my knowledge, balanced to standard continents.