I totally identify with not being able to read my own writing sometimes! For me, I think, mood is a much more significant factor when I'm trying to critique my own work just because I'm naturally so much closer to that piece of work than I would be to anything anyone else has written, and I often find myself forgetting that if you've written and re-written the same piece several times over, of course it's going to read as predictable and overworked because it's yourself writing it and working on it! That can get me into a really negative spiral sometimes. When it comes to critiquing the work of others though, I'm much more critical of why I feel the way I do about a given piece of work. If I can't find pieces of evidence that I can specifically highlight to support my initial feelings about a piece, I stop writing my critique, re-read, and try and assess the work on what is actually present rather than just on my mood-dependent first impression. I think when it comes to giving in depth feedback, though, this happens naturally as you try and put together concrete improvements that people can make. I think also when I'm critiquing myself it can be easy to indulge the desire to rubbish my own work and tell myself I'm terrible, whereas when it comes to others my focus is always much more on helping.