I'd recommend against Yoshi and Rocket Slime, personally.
I thought Rocket Slime was an absolute blast for the first few hours but it that enthusiasm faded and all that was left was a overly simplistic Zelda clone with a series grating, forced attempts at humor and paper-thin gameplay.
The tank battles were indeed fun but the fact is that, like the rest of the game, they're so easy that have to try to fail. I died once in the entire game, during a tank battle where I'd forgotten to put the new ammo I'd gotten into my tank.
Yoshi has all the elements of a good platformer, but plays everything so safe that it just feels bland.