Patents
I would have more sympathy for the patent system if it was usable from both sides.
It should be simple to register a patent and defend it successfully against infringement.
It should be simple to determine whether an invention infringes an existing patent.
At present, I think it's weighted toward defence - although that can still be costly. But I don't think it adequately allows for searching, and can be abused to make it specifically difficult to find a relevant existing patent.