> I've read some of his texts on politics which were not very good, but I guess he was better at physics.

You know, Einstein was famous for his works in physics and was hailed as a world genius by his contemporaries? His insights into other topics might not have been ground breaking, but it is hard to argue about it with for physics.

Edit: The thing is, judging his intelligence based on his writings about politics is like judging the intelligence of famous politicians by how well they write about physics. People who aren't experts at a field will always look like idiots when they write about it and are still learning about it.