actually, intel HD or Graphic Media Accelerator are not dedicated card, which means they are build in the CPU or Motherboard Chipset for basic office working, video watching and other small games.
advantage is lower the cost and battery comsumption so prolong the battery life.
so depend on what game do u want to play, if u want to play movies, internet, office work and small games like plant vs zombies or facebook games, it's ok with Intel.
but if u require more than this, u'll need to add a dedicated graphic card, depend on ur budget.
so the choice of dedicated card will be depend on the brand, budget, size of laptop.