The M5 Recoilles is much too weak and the reload times are ridiculous. You shoot and reveal your location so the vehicle can destroy you without you being able to do anything.
[CM - post edited to...
@HeinzMetzger You need to practice more. I play against skilled users of the M5 when I'm tanking and they pull off great long range shots and have you below 50% easily forcing you to have to retreat.
With minimal splash damage from the main tank shell and a useless MG they are very hard to kill if they use cover.