You rock Ill, we are usually right on the same page. Glad to see that I am not alone in this.
As someone stated earlier, the failure of these films isn't just on account of the lack of connection with the games or the storyline there. It's also that it completely loses any of the qualities that come with the genre at all.
As a zombie movie, it lacks the suspense and human drama that is so important to that genre. Even Shaun of the Dead, which is basically a comedy, manages to brilliantly merge the drama and fear with the comedy...which gave us a magnificent film and cult hit. The RE movies fail miserably on the Z front.
Even the zombies themselves lack menace and don't add to a single gram of fear throughout the entire 3 film lineup.
As an action film, they push the limits too far into camp. Alice is too extremely powerful, which doesn't mesh well with the games or real life... so where does it fit? Nowhere. Which is why it fails.
As a drama, it lacks acting talent and characters you give a damn about.
On the story level, things change so dramatically from film to film that you don't feel a overall continuity to the "saga", if you can stomach even saying that.
So in summation, it is a complete failure to not only RE fans... but zombie fans, action fans, and anyone who enjoys riveting intelligent horror.