Mine has gone up a lot, I've seen up to 12k on warriors and plenty of 9-10k hits. Check your combat log for resists and absorbs. A lot of classes have magic mitigation now.

Sometimes though, it's just completely unexplained. Ran into a DK with 21000hp today, 4x flame shock, 4x lava burst, 4x chain lightning combo did not kill him. He didn't use anti-magic shell either.The lava bursts crit for like 6k. I have spell penetration in case he was in frost presence. who knows?

7-8k with 2200 spell power sounds about right. Now, 2900 spell power with clearcasting up is where you see 10-12k.

p.s. change your subject line to a question maybe?