Are decompilers actually useful for anything practical? Like yeah you can take a .exe and get source code out of it, and if you compiled it again you should in theory get the same program, but when you decompile something you end up with source code that is totally unreadable. It seems like it would be practically useless for most cases. Or is there some way to make it more human readable?

This came out of wanting to look at the source code for that old fish tycoon game... pic related is a random piece of decompiled code.