How to avoid a site from being banned?

Some ideas & questions...

[DeFresto]

Hi all.
In the last time i am more and more worried about developing sites that are "Google-Friendly". That means to make the sites that Google moderators would like.

Let's imagine we have a site that:
- doesn't have anything invisible
- has got no spam links to it
- all links are made as for SE so for visitors
- content of each page corresponds with the keyword of it

but...
This site consists of doorways made good-designed and intresting for visitors but including same large advertising blocks on each page. Would such a site be baned by moderators for using doorways taking in consideration that each page has different content corresponding with the keyword?

Does anybody knows what moderators like/dislike?

[ciml]

If you have a lot of good, unique content, deserving a lot of pages, then I would be surprised if Google would have a problem.

Google's job as a search engine is to help people find content, so it shouldn't matter if you have advertisements in addition to content.

If the pages consist more of "large advertising blocks" than they do unique content, then I would start to worry.

[DeFresto]

I would say 50%/50%
The content is unique and deserves this number of pages, but wouldn't the intensive use of keywords on pages and by linking between them cause a ban...
I mean a manual ban not automatic one.