Plain old fun.
I’m glad, Necros were viewed as somewhat underpowered before, to the extent that even Necro players weren’t sure if they were making a difference.
It’s nice to see that Terrormancers add that bit of, ’I’m actually doing something noteworthy for my team – as a Necro.’
They finally gave necros a powerful tool (fear wall) to put them on par with mesmers and guardians for WvW utility.
The thing I really liked was at any given time I wasn’t like a god, or unstoppable, but a valued part of something.