They specifically changed track with this one as far as character goes due to complaints about FC3. That is why there isnt much actually vocally from Ajay. Its also the reason there is a lot more humour in this one. Personally I love it, and love the fact that all 3 of the FC games I have played have a totally different environment. Stops them from having that same old same old feeling that you get with the likes of Battlefield, Call of duty and numerous other franchises.
I promised myself I would not play FC4 until I finished AC Unity and The Crew, but I failed to keep that promise as I have been addicted to it for a couple of weeks now (think I have logged over 40 hours and not even completed the story yet as off finding all the posters and letters etc).
Other than those three games mentioned, I am also playing Driveclub on occasion and WWE 2k15.
