This may have also been a good idea to post on the Forums, if you haven't already, since you'll get more back-and-forth discussion that way. What Hubpages DOESN'T want is stuff like: "What I did today" or "My cat's day" - in fact, hubs that are diary-like (in the case of non-fiction I mean), actually can be flagged for being in the category of 'Purely personal' - told from 1st person point of view all the time, and only of interest to those who already know the writer. Instead, what Hubpages DOES want are informative articles which are likely to be found by searchers on Google. For example, while the rest of the world isn't likely to search for what you did today, they may be likely to search for "How to change the oil in a lawnmower" or "English literature reading list for beginners". In the case of fiction, people might search for example for "poems about bears" or whatever.
However, I have described both ends of the spectrum (Purely personal vs informative how-to's). In reality there is a 'grey middle' where it becomes very hard to classify whether something is purely personal or an informative article. For example, someone could write about "How to change the oil in a lawnmower" from a personal, diary-like perspective. Would this be OK on HP or not? It is very hard to say, although I suspect it would be fine. Also, some informative how-to's will be successfully written from a mix of viewpoints and that is OK - an informative impartial researched component, and a colloquial description of the writer's experience with this topic - often this is actually helpful to show the writer has actual hands-on skill with the topic, or it can simply make the article more engaging and readable.
Overall, I think that if a hubber has the odd hub here and there that is a bit more on the 'personal' category but the rest are informative articles (or fiction), then that hubber is unlikely to get banned from HP, but what HP REALLY doesn't want is for people to use it exclusively as a diary-like blogging platform. E.g. if you have a series of articles going like this "Day 1: Mon: My first day blogging" "Day 2: Tue: Not making much money, looking for a job" ... etc (Day 3, Job hunt, Day 4, look what my cat got up to), this would NOT be an appropriate use of Hubpages. A good guideline for what HP *is* looking for is for each hub to have at least a theoretical chance of being found by a search engine.