seo mistakes

hi friends, there are some seo mistakes which affect the ranking of site. According to latest seo reports the most important factors which lead to lowering in ranking are

1) Web page title
2) Using graphics, flash and animation in excess
3) A complex menu system

Title is identification of a web page by which search engine ranked in proper keyword. by using un related title or not using title tag affect the ranking of a site.
Graphics and flash are harder to read by any search engine crawler. So, if possible use limited graphics and animation code for a site.
Some times a complex menu system affect the site popularity and also affect the no. of visitor visits.