That's no contradiction. It is accurate enough to fail at area denial. It is inaccurate enough to fail at its role as accurate artillery. Its performance is in between and it is the worst heavy artillery in the game. Instead of answering to the famous forum troll Katitoff, we might want to take a look at the points players are bringing up.
If it's too accurate short range and too inaccurate long range, you have a perfect sweet spot in between for every situation that you need to deal with.
The PWerfer is no area denial tool, it is not designed for that. For area denial, there must be some kind of damage over time, like flames or multiple volleys. The PWerfer is a long range sniper and wipe machine that takes out key units of the opponent. For this purpose is can also react way quicker than the Katy, since only the battery needs to turn which is quicker than the vehicle.