Why else do you think that every pro elf player (Moon, Soccer, etc.) masses DotT against Orc despite the Orc making the best counter strategy against DotTs right off the bat against something that you'd think Dryads + Bears should own (Medium armored melee units + casters with limited buffs)? It's a simple fact that Ensnare is a retarded element in the game. Any decent Orc should never get nailed by big melee like Bears because your army moves at a fast phase and can root everything for long periods of time.
An Orc player complaining about Bears is like an Undead player complaining about Chims because he doesn't move his fiends back after webbing.