Monks can tank fine right up to raids, at which they don't excel. They are also superb pullers and can also dps well. Tanks are in short supply on P99 and monks are considered valuable group members for all of the above.
Enchanters are group powerhouses as well as adequate soloers. As one of the Holy Trinity, you will get a group pretty much anytime you want one. Resists are a bit off still so it can be a dangerous job either way.
Warriors are awful. I don't know who invented this class but they had no love for it. They are limited to weapon aggro with Taunt broken (how much longer... Velious??) and tend to get groups killed. The do level fast and are the best raid tanks, so they can be rewarding at the highest levels.
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