Plane Sailing said:
...Pardon?
Hobgoblin Warcaster:"You runty kobold minions attack him first"
Minions "But all his defences are 25 or higher! We can't even touch him!"
Hobgoblin Warcaster "Ah, but your wild waving will frighten away his mirror images"
Minion 1 rolls 1 "miss"" (one image goes)
Minion 2 rolls 3 "miss!" (another image goes)
Minion 3 rolls 2 "miss!" (final image goes)
Hobgoblin Warcaster now attacks the measly defence 19 wizard whose protections have been stripped away by the baby kobold minions...
How is this much different than in 3e?
Hobgoblin Fighter:"You runty kobold minions attack him first"
Minions "But there are 4 of him! How do we know which one to hit?"
Hobgoblin Fighter "But your wild waving will frighten away his mirror images, so get poking, pansies!"
Minion 1 rolls, hits AC 16, but strikes an AC 10 image instead - one image goes
Minion 2 rolls, hits AC 11, but strikes an AC 10 image instead - another image goes
Minion 3 rolls, hits AC 9, and misses everything
Hobgoblin Fighter now attacks the AC 19 wizard with 1 image left (and a 50/50 shot to whack him), the rest being stripped away by the baby kobold minions...
Is the new version worse? Yes. Is it worse by leaps and bounds? Not until higher levels, when casters in 3e get a max of 8 images. The AC 10 image (adjusted only for size, not dex or anything else) is an equalizer.