The concept is fine. What people (at least myself and some others) don't like is that everything the commander has with the exception of rangers is not worth picking at all. Compare this commander to any of the okw commanders (except feursturm lel) or even existing usf commanders (even rifle company IMO ffs) and it really doesn't stack up at all. Since that's the case, it should be tweaked to remove that issue, but "well people voted for it so take it or leave it" is neither a solution nor a constructive move towards one, and is completely irrelevant to a balance discussion.
Those rifle nades are bloody good. It's like a mini mobile mortar. As far as urban abilities go this is easily one of the best in the entire game hands down and will even be good in open maps where cover is scarce simply by cover denial.
If the dozer added more armour as well as health it would also be incredible for urban combat. The calliope buffs really did a world of good for the unit and it also effects the other calliope commander as well (2 for 1)
No, it's not the "Pershing battlegroup, airborne rangers, calliopriest and air supremacy commander that players seem to think as a viable option but it is a good commander and think it will be a must have in your load out for team games.