I never played 1-3 to AV4 was awesome.I purchased AV5 ten minutes after I downloaded the demo.
I just restarted AV5 after being hopelessly lost and utterly decimated by the Sentinel Workshop.
So a 10 for me.
I had forgotten all about my invulnerability potion until in desperation I tried it last night and it really turned to the tide. My wizard was the only survivor but he's dead.