The Problem with Grass is that Bulbasaur, Chikorita And Snivy are just not as good as the other starters in the game. Also Given the fact that if you want a fire type In DP you either had to use chimchar or Ponyta which cut options for using it as well, have pretty much gotten me to the point where I almost never use the grass starter in Game, then as you are going through the game, Water types give the coverage's grass types do, and until Gen 5 Waters were necessary for HM's and you get to the point where most of them are just underwhelming compared to other options. Which is a shame.

They are defiantly a type for competitive over ingame.