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I recomend that everyone takes the time to read through the comments posted at the Linux Game Tome.
Talad's posts there are very revealing, though he's made quite an impression here as well. Something else of note is that the same "fanbois" who joined this forum to attack Planeshift's critics make similar appearances on tLGT.
My experience with Planeshift comes from years of play and observation. The newer versions of the current release are far more stable than previous versions. Disabling sound further decreases the frequency of crashes, but I enjoy the ambient noises and music. It's hard to do much of anything without levelling your character, and aquiring skills recently became unreasonably more difficult, but the game can be fun and addictive. People still enjoy exploring the game world, socialising with other players, roleplaying, and duelling. I'll note that people shy away from duels because the PVP system is very unrealistic and lag-dependant. The roleplaying community has dwindled in the last year or two but as an 'old timer' I'm likely to look fondly on the gold ol' days no matter what.
One thing that people have learned about enjoying the game is that it helps to limit contact with their forum, devs, and gamemasters. Questioning a GM's decisions or authority is a quick road to a ban. Their IRC channel is also a bit of a flame pit.