After I enlisted, the last thing my recruiter said to me was, "If you decide you hate the Navy, do your four years and get out. Suck it up, be a man then move on."
bgmann you listed four main reasons for wanting to break your contract:
1. Poor training - most likely it is the same now as when you signed the contract
2. Poor pay policy on upgrade - same as when you signed
3. Having to print out your own updates - I admit this is pretty cheesy, but probably the same as when you signed
4. Poor MX - this is the only reason you listed which I (if I were interviewing you) would see as a valid reason to break the contract.
And as for being pressured to take a bad aircraft, a good pilot must never succumb to pressure. Whether called "get-there-itis" or being threatened with termination, as a pilot it is my job to make a safe, legal, and prudent decision. If someone else "forces" me to take a bad flight, I cease to be the Pilot in COMMAND.
If you feel undue pressure is being put on you then leave. But be willing to accept the repercussions of having made a poor choice.