If something is uncontroversial it won't cause disagreement, conflict, or controversy. People who actually like to argue might think uncontroversial means "kinda boring."
You've probably figured out that the root of the word uncontroversial is controversy, which means "causing strife or public disagreement." It's surprising when local or national government decisions are uncontroversial, because there are usually at least a few dissenters for every issue. If you're a passive person who doesn't like confrontation, you probably hope that everything you say is uncontroversial.