I actually agree all the other Mario RPG games were better than Super Mario RPG. I played the game first on the Wii...so I didn't have any tainting of the game system being revolutionary at the time...which should get points at the time, but should not have any real determining factor which is more fun and enjoyable in the future.
When I look back at Super Mario RPG, I thought the controls in the overhead exploration were not perfect...and it caused problems for me. I thought the characters were bland. Yeah...I am looking at you toy man Geno. Boring.
I thought the gameboy advance Mario RPGs are by far the best with a great sense of humor not often found in RPGs. An action combat system that is nearly perfected. Yes, Super Mario RPG did it first, but it is so much better in the GBA Mario series.
But in the end, these are all opinions, so to each his own.