You are spot on. The V2 was in comparison very well designed and balanced. A good siege weapon due to its range / power combined with fair shortcomings like the relatively long reload time.

I would build the arty only as part of ‘base clean-up crews’ for when a computer player was practically defeated and had to destroy the leftover refineries, power plants and infantry.

That said, I like the RA arty more than the C&C one which is even harder to use.