 If you liked
.hack//G.U.+
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 ...then you might like
Yureka
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This is like the korean verison of .hack, with much more comedy. In G.U., its serious right off the bat with the real world in danger because of theWorld(the net game). In .hack, characters are going into comatose because of a virus called A.I.D.A. Yureka, the real world is sort of affected at the beginning with the fate of the company in the hands of how the players play. But later people actually can die because of the game. Both use a net game as the base of the story and have unique classes, .hack is a tad more serious with less jokes.