Nikosandros said:
Did they? I've just looked at the errata and it seems to me, that if at least a 10 is rolled then, half damage is indeed inflicted even on a miss... of course, the 10 threshold does make quite a difference.
When it first came out, area effects worked as follows.
You place the template, and roll your attack roll, if you rolled under their Reflex defense they took half damage, if you rolled equal or higher it they took full, if you rolled a natural 20 they took double damage.
I'm not sure which order the following errata came in but they added (or clarified) the following.
1. If your
modified attack roll is less than 10, then you did no damage with an area attack.
2. If you are in cover and the target rolls less than your reflex defense you take no damage.
3. If you roll a natural 20 on an area attack you no longer critical.
Now if you introduce 2 without 3 it actually makes things worse as players start to group in cover to avoid the half damage but instead end up all taking double damage with a critical.
This would come up a lot in Star Wars because everyone had to option to do a area attack with autofire weapons like blasters that everyone had easy access to. It might not come up as often in D&D as there aren't as many area attacks, but once could be enough to ruin the campaign.