I run a site that carries mostly user provided content.
We get anything up to a couple of hundred article submissions per day and, every day we reject most of them. It is not that we have impossibly high standards but more usually that members submit articles with fundamental problems that, if addressed would help them with submissions to most other sites.

Recently we have started to see an influx of content from people who seem to be using Article Builder. On the whole we welcome this but there are some points to note:

1) Providing a title that carries your keywords but that has no relation to the content provides will see your article deleted. This morning I deleted an article with a title about insuring the health of horses, the content was about dog insurance and no mention of horses at all.

2) If you are trying to use local keywords then make sure that the context fits. If it does not fit then we delete.
Here's an example of what works and what does not work:

...provided by SEO outsourcing companies England have been...  UGGHHHH!!! DELETE

...provided by English SEO outsourcing companies have been... OK Publish!!!

The first example will get your content deleted from many sites. The second is perfectly fine. Search engines use a system called LSI (Latent Semantic Indexing) to extract meaning from website content and understand that Indian and India both refer to the place. There is no need to mangle the language to get your point across.

3) Sticking with local keywords for a moment. If you write an article about, for example, laser eye surgery in Chelmsford, then it is not good enough to simply have a generic article and then paste in something like 'best laser eye surgery Chelmsford provides expert service' It makes no sense and does not help people looking for info about laser eye surgery in Chelmsford at all. This gets deleted.

Go for something like this: 'Dr Smith's laser eye treatment centre in Chelmsford is the best because they only employ qualified opthalmic surgeons' Now you have provided value to readers and a cue to the search engines that this is an article about laser eye surgery in Chelmsford.

4) At the moment Article Builder is a new service but over time there will be a huge number of 'tips' articles floating around and I expect that they will routinely get deleted just as we tend to do when we get a raft of PLR submissions all on the same topic of the day.
To avoid this try to use the tips as a part of a 'proper' article, one that is making a point and has a beginning, middle and an end.
Try to get the tips closely focussed on a topic, so, for example, if writing about health insurance try to focus upon a niche, maybe health insurance for old people, or getting the best deal with an employer based scheme. This means selecting the tips that are going to be used and then writing an introduction and conclusion specific to the theme.

5) If you are going to spin paragraphs together to make several articles into a single spinnable seed article don't try to rewrite them automatically, at least not for article directory submissions. The quality of automatic rewriting is too poor and it is unnecessary. You are almost certainly better off submitting very readable content that is not unique than submitting unique rubbish that gets deleted and never published. (Copyscape is NOT your friend here!)

Please do not shoot the messenger, but if your native language is not English, or your written English skills are not good, then do not even think of using spinning or rewriting tools. Stick to basic Article Builder content and you will do much better.