Yesterday we had our first Halo 4 Lan-Party and I was the only one using Thruster Pack and -for the first time in my life- I used Bumper Jumper button Layout. 
  
It was awfull in the beginning cause I used to play with the "Recon" configuration. 
It was so bad I looked like a real  NOOB half of  the night, but ............last 5 or 6  games of 20 minutes I was the KING!! 
  
Thruster-pack is great, just like Bumper-Jumper is.  Please do not change things 343........the game is perfectly balanced and the thruster pack has saved my 
life many times, sprint'/jump/turn.......Thruster and it's just enough to get away!! 
  
All I want to say is -give it a chance,  it really is just enough to get behind that rock, jump of a building etc. 
  
It seems  343 has  done a great job here.......no more plasma-grenade overkill, no more stupid armor-lock which could sometimes comepletely destroy a vehicle and slowed the game down.....I would  give this game a ten. 
And the fact you can't Bumper-Sprint with none  of the button-layouts is also done with a reason...........