The first 5 years of the USAF were great. The last 4 were garbage.
The first two years are pretty much your schooling and on-the-job training. After you know most of your job and hit your stride, it becomes fun. After you prove yourself, they start giving you more and more responsibilities - this is, for some people, where it gets tricky.
Depending on what responsibilities you are given or what curve-balls you are thrown, it could help or hurt your career.
My curve ball was being given a really messed up equipment account, that I was lied to about by the previous custodian, not long before a major inspection. I also gained a new section chief [direct boss/supervisor] who was a guy whose toes I had recently stepped upon, so there were no excuses for how boned things were. I got everything straightened out very close to when I separated. During my last deployment, I started to really enjoy my job [on the flightline] again, but at that point I was so disenfranchised, there wasn't anything that could keep me in. I had very little debt, was less than "halfway" to a 20-year retirement, didn't have OR want any kids, had no nasty medical conditions between me and my wife, and besides, I was ready to be free again.
Your experience may vary, so keep an open mind.