Yeah, Herman is fast, but it seems like he's been focusing on speed ever since he started playing guitar. I'm sure if someone had been doing speed exercises for 10 years or so, you would have pretty damn strong tendons. Also Hermans riffs sound like 3 or 4 notes played over and over. He is good but not that great, he's too overrated.
Alexi has more skill, and it is true Bodom makes good use of all elements in their music. I think 70% of Dragon Force fans are just impressed by Hermans speed. Almost all Bodom fans just like the music.
I hate Dragonforce's singer, he looks like a poodle, and his voice is just out of place and kills the music. They need a vocalist with a raspy strong voice, not some singer who could actually fit well in opera. Supposedly DragonForce is influenced by 80's rock. They sound like Japanese music sped up with an opera singer singing over it. Experimenting with elements of music can be good but in DragonForce's case its bad. They could actually be legendary if they get rid of their singer, change their riff style, and make better lyrics. But who knows, they might keep their sound and change it for the better.