I'll echo everyone that says 2 and 3 (or 4 and 6, depending on how you look at it) were the best.
It was like a drop off a cliff after that for me. I liked 1. I liked 2 more. I played a good amount of Legends 1 and Legends 2 on Gameboy (both ended up too big for their own good.) I played the crap out of Adventures on Gameboy (so good!) I absolutely loved 3, and I loved Secret of Mana, which was like a bigger, deeper Zelda.
And then I stopped caring. I think I realized that all of these games were just too big for me. They'd become 80-120 hours of pushing forward in a linear way with random fights. Halfway through I'd get tired of time-wasting fighting and just want to push through the plot, but couldn't. If I put it down for more than a couple of weeks I wouldn't be able to pick it up because who could remember where I was and what I was doing. As opposed to Western RPGs, which were more open ended, allowed me more opportunity to avoid stupid fighting, and could be picked up and played easier because it was harder to inadvertently backtrack.
Never played 7. Sometime between 3 and 7 I decided I hated japanese RPGs. I stand by that still.