Such as the same keywords repeated again and again in Title, Description, Keyword meta tags and body? That is why i suggest using partially matched keywords.
With the latest major Google update (Penguin 2.0), latent semantic keywords are important to keep your content looking natural. For example, if someone where writing about an “Internet marketing company”, chances are that they would not refer to the enterprise as an “Internet marketing company” in every single instance. Therefore, it is important to use phrases such as “web advertising firm” and “online marketing business” as well because this is a more natural style of writing.
Keyword density does still matter but not as it was. Write your content around keywords but over use keywords or you will get slapped by search engines.