Necromancer is a very enjoyable class with a wide variety of utility that can be brought into solo content or groups.  Self synergies, summonable pets, with good single target and AOE can make them a prime class to move through all content.

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The Grave Digger is extremely fun and one of my favorites to play, but it can be high maintenance.  I suggest using your tab target feature when using to make sure you can focus your Blast Bones appropriately and watch your timers so your DoTs don't fall off. If you find you are over-managed  focus on the first 3 skills on each bar and keeping them going until you are comfortable, then move into the last couple skills