A blank project will build in to a minimum of 200 MB.

Making a full rebuild, including engine can take a good 30minutes. If you plan to use Unreal professionally, you better get some licenses for Incredibuild as well.

This engine is not easy for beginners.

5% of profits will go to Unreal after $3000 earned in a quarter.

If you're installing it on mac, you simply download epic games launcher and watch it download nothing endlessly.

Especially when compared to its primary competitor, Unity.

Most of the "documentation" for code is actually just automatically generated from the source. If you're interested in knowing how things are supposed to work, you must either go to their answers site or pay for UDN.

Often their examples won't even compile, since they were written for now outdated versions.

The epic games team only assists with billing and account issues, not bugs.