It is the spread and rate of firing I think it the thing in most games suck.
For instance, BF2 artillery fall in a zone, and if your in it its a instant kill, no escape, cause the number of rounds and spread is too minor.
Artillery when falling in an area should have a bigger spread and round per minute should reflect the battery size, say a battery is battalion size it may only be 6 guns firing, with a 20sec firing cycle that is 18 rounds over a 100 by 30 metre spread, remembering round fall more in a short long configuration then a circle configuration.
Most people were injured by flying debrie, but if you lay down 80% of the time you should be safe, unfortunatley people don't model artillery well in games.