I'm playing Pearl right now, and while I do find the graphics fantastic and the whole Sinnoh area interesting to explore, I feel as though there is lack of a decent variety of Pokemon (from that region). There is hardly any fire types for example, so I had to pick a Ponyta. Don't get me wrong, I do love the Pokemon from the Kanto era, but, the game itself should be promoting new and different Pokemon, not throwing in the older ones (the majority of my team are Pokemon from older regions).
I'm a big fan of Pokemon Red, first of all because, lets face it, it was the first time we got to experience Pokemon that way, but secondly because that region was unique and had its own Pokemon and adventures etc.
Plus the storyline gets boring and I find myself wanting to play Pokemon FireRed or Sapphire.