I'm hitting 4.
I've seen a forest, a desert and a volcano before numerous times in Zelda games while SS's were nicely thought out and rather enjoyable i hated seeing them again and again and again, there were new areas to explore but a desert is still a desert, a volcano is still a volcano, the music didn't change dramatically for new areas, there were no new elements and the enemies stayed the same.
I didn't enjoy the timeshift stones, an it sucked that the game waited until Lanayru desert to bring them in, they were nothing but a gimmick to me but gimmick nonetheless, i'dve liked the other regions to have a unique gimmick too. The Sand sea didn't wow me with the sand changing to water, it just didn't look or feel impressive to me.
As far as the dungeons go, they did look unlike many Zelda dungeons that i've seen, however this wasn't a good thing, large circular hubs branching off into smaller hubs and intil you hit a boss door. There were no defining elements either, the overworld acted like an outdoor assault course, the dungeons operated the same way but indoors with keys needed to progress, the dungeons didn't do anything differently than the overworld did which made things boring.
There weren't enough areas either, case in point; Faron woods - which had to pull double time as a temp water region. that really annoyed me.
SS had such potential when we take its story into consideration; it could have had places we had never seen before; We could have had a region that had been decimated by Demise's battle with Hylia, full of redeads and cursed enemies, cracked scenery with broke when you interacted with a number of times which would force you to find another way around, it could have been exclusive to the past too beyond the Gate of Time, just to make all the time travel lark worth it. (Thats another thing, it'd have been nice to go to the other regions while in the past...) We could have had Hylia's palace of worship, she was bound to have more than one while the people were still on the surface we could have had a dungeon in there...
In fact blow SS wide open, why couldnt we have 3 different and exclusive provinces in the past? that would have been wonderful.
I should hit 3 now...