Are you asking if the EQ Client can be played really well on linux or the server? If it is the client your best bet is to check out
Transgaming. They have it working well under their WineX. If you get it to work and like it I would ask that you support their project. $5/month isn't that bad and it goes to further development into getting Windows games to work through linux. As for getting the server to run on linux last time I ran the server it was stable and took less resources to run than the windows counterpart.
Hope that helps
TheClaus