Frenzy is still very potent, and i often give it to my blitzers, blockers and big guys when they roll a double. Norse blitzers don't need to roll a double, and they start with it!
Jump up was made a trait so that we wouldn't see players with piling on and jump up anymore. Since norse blitzers don't even have access to agility, if they didn't start with jump up, they couldn't get it, even on a double. Now, they can have the most feared combo in the game (piling on + jump up) after just one normal skill roll. The only things i like to add to this combo to make it as powerful as possible are block and frenzy to make sure you bring the opponent down, and they start with both those skills!
Block, of course, is a no-brainer.
Norse blitzers after one skill (piling on, no contest) are killing machines. After two skills (mighty blow being the obvious second choice), they're as fearsome as mummies.
If you honestly think that norse blitzers aren't one of the best 3 blitzers types of the game, i suggest you try playing against a norse team that has 4 piling on blitzers. I garanty that you'll change your mind.
I was comparing norse mainly to amazons, which are the team that ressembles them most. While norse get the best big guy in the game, amazons don't even get a big guy at all.btw, which is "the best big guy in the game"? And cannot a number of other teams take whichever it is? Not much of an advantage then.