bringing this over from the All Seasons thread because it's only about Shaw.
stealinghome, I don't have much substantial to add, but I felt compelled to reply to this because I strongly agree with all of what you wrote. By the end of the season I'd come to believe that all important Shaw moments should be reviewed by Amanda Segel: She's the only writer I trust to have a clear vision of the character as created. Normally I would add Nolan to the list, but the fact that the inconsistency is getting past him makes me doubt that he can see the problem.
Some of the writers seem to view Shaw's personality, psychological history, and ethics as Reese-like and, therefore, amenable to a standard 'redemption arc' when, in fact, Shaw is closer on those facets to Root and, as such, any changes she makes should be driven more by rules than personality development. Thus, one episode would have Shaw giving parenting advice or talking about wanting to get better at being nice to people, and another ep she'd be, well, Shaw. That said, I did see evening out by the end of the season, so perhaps someone on the writing staff finally noticed the problem.
I would add that I thought they did a better job illustrating Shaw's unique contribution to the team when she was on the edge of it in early S3. The downside of those early eps was that they focussed too much on the "hulk smash" angle, rather than on ethics and tactics.