I agree it's cartoony, but because of that its helped on the flip side of not looking dated as time goes on and graphics get better.
It's similar to EQ and then EQ2, the graphics looked amazing during their time period, but now - it's dated.
The only other game I could suggest would be FFXIV - able to multibox as well, it's not as friendly and you need a beefier PC though.
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