I hate this myth that the orcish warrior is nothing more that a zerg, throwing himself at forts until the stone breaks.
That is a very offensive view, and ignores basic facts about the typical orcish pike formation. Firt of all, not all orcs are bersekers. Those are special warriors trained from birth to be the most vicious, to break shield formations and disrupt enemy lines, but that's not all there is! You don't see the pikeorc jumping into the fray alone, and you don't see the siege engineers in the frontlines at all!
Second, not all orcs are infantry. Archery is a proven and proud orc tradition, but unlike the typical elvish longbows orcish archers stay behind the frontlines, like any sane individual would. There's also orc cavalry, typically discounted as brutish raiders. Combined arms, ever heard of it? Those orcs in warbeasts are as much part of the army as the shield&sword frontliners.
Third, the orc weakness is hugely exagerated, not helped by the fact that most famous nattles in the recent era were in bottlenecks and urban centers. Of course orcs will attack a defense fort with overwhelming numbers, that's how it gets done! The soldiers can't just wait idle for months at a time before the fort falls, logistics and morale wouldn't allow it and unlike elves they actually need to eat.
Fourth, orcish medicine is quite advanced, so even what usually looks like a deadly wound isn't nearly so in many cases. Compare humans, who die if an arrow to the tight gets a bit of dirty cloth inside the wound.
And that's without mentioning the orc generals like Traka, Gothmog, Mauloch or Grom.