I wouldn't say so as well, but more for time constraints.
While Guild Wars 1 prophecies (the vanilla version of the game,) is still fun, for the full experience you'd have to play through the expansion games as well, specifically nightfall, which in turn allows you to play the eye in the north expansion, which is the one that contains the Hall of memories for use in GW2, which all in all you may not complete before Guild Wars 2 comes out.
That said, if you have a full month to kill (and I do mean full,) you can certainly play through it and not be disappointed, but while it provides the first and best description of the history of Tyria, its not really a requirement to understand much about GW2 other than basic lore, which you could get of the wiki if you're so inclined.
To answer the latter questions, I've seen a few people on the Gaiscioch vent playing GW1, but I don't know if there's anything resembling a guild server.
» Edited on: 2012-07-25 22:21:22