Savagery doesn't mean howling, raging berserker. They're portrayed as disciplined.
Additionally, you seem to be mixing gameplay with lore. What fun would it be to play a campaign where you effortlessly sweep aside all in your path? Establishing the orcs as a credible threat to the Night Elves doesn't imply they're weak, unless of course Murlocs slapping the Darkspears around means they're weak and worthless too.