Hey Rythem welcome to the game. There are a ton of stats to this game and over time they will gradually start to make sense. The value of the weapon or armor does not make it the best. It may be that it has a magical quality to it or it is a rare or unique item. You can tell if it is magical, rare, Unique, or legendary by the amount of stars the Item has. 1 star is magical, 2 starts is Rare, 3 for Unique, and 4 for Legendary.
The armor rating is what you want that will determan the Items actual armor value. (how much protection it is going to provide) The higher the better.
For weapons just look at the damage output. There should be 2 numbers. An example being 45-67. Again the higher the better.
The rest of the stuff are secondary attributes to the Item.
Regen penalty is the percentage that is added to your combat arts regeneration abilities. This can be negated by other stats or items of course.
The sockets allow you to put magical Items into the weapon or Armor to enhance it. The different colors tell you what type of Item can be put into it. This is done at a smith.
Root is an ability that will hold you in place. You can still fight but you cannot move. Where stun keeps you from moving and fighting. BLOCK CHANCE: Root +7.3% means that you get an extra 7.3% chance to keep from being rooted by an enemy that has the ability to root you.
Hope this helps a bit. Just read around on this sight and you will get the hang of it in no time.