Grenades are an investment for USF in MP and Fuel + ammo to use, which delay your tiers upgrade. If you believe it shouldn't negate your MG lockdown, here again you're 100% wrong.
Smoke comes too early,it invalidates the main lynchpin of ostheer infantry tactics too quickly,combined with grens totally bullied by rifle DPS it overpowers ostheer rather easily.I wouldn't have problems if smoke was avaialable aftre lieutenant.
Its a iwin button.Setup and reposition takes so much time,before u again setup he's on top of you or close enough to gun down mg gunner/grenade wipe.Usually once mg is made useless,rifles walk over the poor grenadiers who can't do anything,totally outclassed -and then mass retreat.