Superhero movies in general tend to struggle when they have a main character fight anyone who isn't another main character. I suppose the intent is to make the hero or villain appear powerful by having her defeat a bunch of badass normal people but what usually ends up happening is that the normal people just look like losers instead. Thor himself had the same problem when fighting Surtur's and Hela's minions - they looked scary but they were so weak compared to him that the fights were comedic instead of dramatic. However, at least Thor's lightning made his fights look cool. Hela's spikes were the opposite of a fun fight scene.

If I were editing the script, I'd have Hela lay siege to Asgard with her undead army. She actually fights the Asgardians and forces them to retreat inside their fortress instead of just humiliating them and they're barely holding out while Thor is on his journey of self-discovery. This would also fix the problem with her own undead minions being useless. They'd actually have something to do (fight the Asgardians) rather than jogging around chasing civilians while Yakety Sax plays.

(Oh and what was up with a guy who can beat the Hulk getting taken out instantly by a taser thingie? If those things are so powerful, shouldn't everyone just be throwing them at each other instead of using weapons?)