WoW is probably only the best if that happened to be the first MMO that got you hooked.
I still think Asheron's Call is the best and I'm sure loads more think that Ultima Online rocks balls...
Nahh, I was there for AC, played it to death until the whole patron exp system changed. It was great and the newness of the game rocked. Am also old enough that I was playing UO from release too
I just don't think anything compares to WoW, nothing has so much content, so much choice, so much game. I think it's always helped that I've experienced almost every MMO released with a solid group of mature friends.
I know many, like you, don't agree.
First or last MMO, I think it's hard to deny just how massively solid an experience it is. Which as I said above, isn't to say the others are ****, just that you can't and won't ever beat WoW, how can you beat such a monster. You can offer something different, something excellent, you can aim to beat it, but everything "WoW killer" falls short, AoC, War, Aion.
From Trapped chests in the middle of town and burglarising my neighbours in UO. Getting that first acid dripping tachi in AC in the first weeks of release to beating the first Olthoi nest.
etc etc,
Great experiences, and fond rose tinted memories in gaming. Just no comparison in gaming terms to what WoW offers.