2/3 of the missions are objective based + transports are pretty cheap = less footslogging armies. At first it sounds like a good idea, then you come across an objective mission where your not making it across the board. Personally I would like footslogger armies to work but it's not happening in this edition unless you go horde, or get pretty lucky.
However I would encourage you to play a footslogger army if it's what you envision your army to be. Always play what you like, worry about being the "bestest" later.