I might be bias because this is my own team, but i beleave we got the most our of our mecanum drivetrain in 2015. I know its not the same because the games are so different, but i believe if you go with a mecanum drivetrain you need to use its abilities to your advantage or else you might as well just have gone with tank drive.
https://www.youtube.com/watch?v=7FJLMB58eVU