It's more of an exerience type of thing.
You can check the attack and aspd of the MVP in db's too.
Check Randgris' for example: http://db.irowiki.or...ster-info/1751/
She has 7k-11k attack with 171 aspd. But also has Weapon Quicken and Agi Up, which take her ASPD to like 185 Add power up and she'll be hitting for a TON of damage. She will hit you hard. She also has elemental attacks, Holy Light/Attack and LoV. They hit hard, but she does not spam them at 185 ASPD, so you just need to survive 1 smack of it. A Holy armor will take care of this, since it reduces Holy to 0% and Wind to 75%. Using a DR here will increase Holy to 50% and Wind to 125%, but using a Thunderproof and Valk Shield, you can reduce it back to 70%, enough to survive with high enough HP. Also, using Alice will further reduce the damage (which you need to do).
Maybe Randgris is an extreme example, but many MVP's either don't use elemental (LoD, Doppel, RSX, Beelzebub), or their elemental attacks are neutralized by elemental armors. Check their skills and fight against them. See for yourself what skills cause trouble and how can you take care of them. :3