I've only purchased a couple of issues since the Class Acts thing started and I haven't been overly impressed with the magazine. Especially with the price increase. I'm sure this has already been argued to death, but with all the advertisements in there, I can't see a good enough reason to raise the price above $5. I've never bothered with a subscription, but with the way Dragon is now, I'm glad for it.
If the content you use or like is limited to a few issues a year, you're better off just getting those select issues and maybe just reading through whatever else comes out while at the book/hobby store.
Like Rasyr mentioned, the fact that you're even pondering this should help you decide. Go with your instincts and let the subscription run its course. If the next few issues after that are worth getting, then you might consider subscribing all over again.