I played an SK in classic through the opening of velious, so I will speak mostly to the Kunark era. SK's in Kunark are pretty similar to how a lvl50 SK is now. Not the ideal raid tank, but not completely incapable. Sufficient for groups, but not a "pure" tank like a Warrior. SKs are much more versatile and arguably bring more to the table in groups than warriors though. SKs hold aggro better, can feign pull, can snare to stop runners, etc. SKs are also capable of soloing efficiently enough. At lvl58, they get the lvl44 Necro pet which isn't too shabby. I was able to fear kite in Skyfire or burning woods pretty effectively which is a nice alternative when no groups are available.
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