Team Rocket Rocks, and if they leave...I leave!
James and Jessie are great characters, and yeah, I agree, they do feel forced into the show at times, but I love how sometimes they quirk their motto to what their trying to do. It always adds comedy :p.
But I admit, they're getting a little old...in the old ones (speccially the one where they use their Submarine Magicarp to make an underwater clip of their theme moto in the Sunken Ship episode in the Whirl Islands...XD I laughed so hard!!
I also like "Go West Young Meowth", that was AWESOME, but...it was so long ago...
But you know what they MUST DO before the show is over? Take Pikachu to Giovonni (finally!!!) but Giovonni thinks Pikachu is stupid and weakless so he tries to use a Thunderstone because he needs perfection, but Ash finally travels back to Viridian City in time to stop Giovonni before Pikachu evolves! That would be the BEST episode ever!!