You shouldn't be sorry. With mario platform games, after finishing it and collecting all the items and rewards, I usually just put it down and won't come back to it for a long time. I think this is mainly due to the feeling that you've finished it and it's boring to play again.
Mario Games are awesome, I dont understand how you dont like them, And you Never finish Mario 1, 2, 3, world, Yoshi island, because even after you finish them there is alway heaps of little secrets and hidden stuff to find
Mario is a classic. How can you hate him? I personally love Mario games. The squishing of the Goombas, and the sound you make when you jump over bottomless pits and when you get a Super Mushroom, Fireflower, etc., are just priceless.