Hi Kyle - really sorry to hear about your experiences. I'm not certain you're an anomaly, but it definitely sounds like you've gotten very unlucky to have such a rough combination of outages. In September, we did have rank tracking broken for a couple weeks. Crawl data has been accurate for 95%+ of campaigns and on time, but there have been a few that needed those manual refreshes (perhaps you've been caught in that bucket several times somehow, which must totally suck - I'm really sorry for that).
AdWords pulled their API from Hubspot, Raven, and SEOmoz all around the same time, so none of us have that access anymore. Thankfully, you can just click over to the public tool and grab it, but I know it sucks not having it right in the KW Diff tool.
The weird one is KW Difficulty itself - that should be returning results successfully. We've had an odd few hours each month where it's busted due to SERPs changes or hardware issues, but it's showing 99%+ uptime on our end. Rank tracker's odd as well - we've been seeing a few odd results, but it's working for nearly everyone (I get my report every week without fail).
In any case I can tell you that there's a whole team dedicated just to making sure that our uptime is high and that as problems/anomalies arise, we fix them fast. That team's called "production engineering" and there's 4 full time engineers there. We also have a larger engineering team that's working on a new version of the software that we believe will be A) a big step forward in features/UI/UX/etc and B) much more reliable and consistent - we're aiming for 99.99% uptime as a goal on all services, even when engines make weird changes on us. I can't guarantee we'll hit that right out of the gate, but I know this team can eventually get there.
To wrap up - it flat out sucks that you had to deal with this. We should be better. We're working on it, and I really appreciate all the effort you've given to stay with Moz. If you do choose to go somewhere else, I'd totally understand and empathize, but if you stay, I promise that we'll have continual improvement.