Is Everyone Allergic to Grievous Wounds?
Seriously, if you see the enemy team have a majority of either self-healing, healing target allies, or is centered around drain tanking take grievous wounds. I don't know how many times my team has been steam rolled because they won't buy a stat that easily cost 800-900 gold. There should be no excuse to see a Trundle, Mundo, Swain, Warwick, or Vlad become a late game monster all because your team doesn't buy grievous wounds to counter their insane healing. Just buy an Executioner's Calling or a Bramble Vest, that's all I'm asking and trust me once you buy either of those laning against those guys becomes a lot easier.