I tried to go Necro/AH as my first main skills with my current character, and it was pretty painful to be honest. The problems with pets are many, unfortunately, and their run speed is only one of them. Their AI is problematic, the behavior modes are somewhere between frustrating and useless (what is follow even supposed to do?), pets are quantifiably weaker than using nearly any other skill lines, they are more difficult to use and more expensive than any other skill line except perhaps Archery (I haven't tried it yet, so I can't say one way or the other on fletching) and pets can't be affected by AoE support abilities/heals/buffs further weakening their utility in groups.

I normally love pets, but they need a *lot* of work from what I've seen.