Instant Game Collection currently "Action Adventure" heavy.
One the most marketable features of the PlayStation Plus service is the Instant Game Collection, which, due to the nature of the service, is always changing, especially for new members. In a post on the PlayStation.Blog, the service's content since June 2012 is shown as skewing towards the "Action Adventure" and "Shooter" genres. Contained in the post though, is a poll designed to elicit users' genre preferences for future selections.
The poll closes on February 21st and applies to SCEE, which hosts different content than its SCEA corollary.
Source:PlayStation.Blog via CVG