At least at Tuska you can stand not very far away in the beer area and see the two main stages.
For the tent stage you can stand to the side in the beer area and watch through the fence.
The fourth stage I never went to
Yeah, it was a bit harsh for a beer drinker at HoM...
Some festival organizers are smarter than others. At Getaway you can also comfortably see the shows from the bar, but it's quite annoying if you want to be close. I remember when I went to Arvika, the bar was miles away from the stages