Well... Can't speak for everyone else, but apart from its massive presence in the SW Saga (five out of six films), I love Tatooine as a SW planet because for the most part it's really there, in North Africa, including a lot of the actual buildings featured in the films. The use of existing environments and locations reflects GL's New Hollywood sensibility (THX-1138 was shot in car parks, highway tunnels etc), and it's the rough-and-ready style of SW/ANH which makes it my favourite of the six, and, I believe, contributed to it being such a massive success, while other 1970s sci-fi films with cheesy sets that would barely pass muster in television - Logan's Run, Silent Running etc - flopped. SW/ANH had some fantastic sets for locations like the Death Star, the Falcon's interior - but when it came to setting foot on a planet, the choice of locations was perfect, and with Tatooine being so prominent (as opposed to Yavin IV), it's brilliant that they found somewhere that could be used so effectively with very little alteration to the existing environment. Hoth, Yavin, Endor, Naboo - yes, they were all shot on real locations, but they weren't utilised to the same extent with real existing buildings and structures sitting so comfortably in the GFFA. Yavin featured a brief couple of shots of Aztec (I think) temples, and Naboo doesn't strike me as 'otherworldly' at all. Beautiful, yes - a setting in another galaxy, no. Incidentally, regarding the poll - yes, it's a crime that Tatooine isn't included, and Corellia doesn't feature in the SW Saga at all.