Game is less trench warfare although at the end all my characters could engage, even spellcasters, and druid could engage like 3+ enemies simply by carrying a shield and having a pet (barbs/fighters etc. can go into somewhat crazy numbers like holding 5+ enemies at the same time). Enemies, however, do not seem to use all these shields, feats, unique items and multi classing, so they don't engage you and AOO you as the character system actually allows to. It's not like you ever have to deal with really strong fighters actually rushing you, with that extra tanking kit that can engage hellton of enemies and AOOs with absurd bonuses to acc & pen.