That's because is so different, (also cause it was another video game in japan who got modified i've heard, but the landscapes are a lot like Mario & the main theme is very Italian!)
I think that all Mario's are amazing, every one was an experience in its time. This has enough Mario elements, it was the real second. (lost levels was just a re-edited Mario 1), also the way u take on the enemies is very fun, nice bosses & killer last boss, very colorful, naive & funny, i just looooove this game, & it resembles to me a little to MARIO64 in some ways.
The ending of this game justifies every difference u may find with other Mario's, is unique & it deserves a direct sequel as well!
I think that all Mario's are amazing, every one was an experience in its time. This has enough Mario elements, it was the real second. (lost levels was just a re-edited Mario 1), also the way u take on the enemies is very fun, nice bosses & killer last boss, very colorful, naive & funny, i just looooove this game, & it resembles to me a little to MARIO64 in some ways.
The ending of this game justifies every difference u may find with other Mario's, is unique & it deserves a direct sequel as well!