It's a matter of judgement. I've read code in languages I don't know, even, where I could immediately figure out what was going on without reading any comments. I've also patched libraries in ten minutes without reading comments. It's certainly possible to write code that doesn't need comments, though perhaps, we're not the best people to judge when that's the case or not for our own code.
Same here. Though if you are putting thought into the code you are writing - the logic, the structure, etc.. Then those thoughts should probably be written down as well as comments.
