Lifeblood scaling is ~1.5% of max health, per
WoWWiki. Tested on my unbuffed bear tank (41.7k hp), I received 853/tick for 4265 total.
While engineering may be tedious to farm mats (or
really pricey to buy), having to craft various sub-components, and skilling up on an inordinate amount of engineer only type items .... it does have some benefits to consider:
Head-
Mind Amplifciation Dish - An extra 8 stam (plus the mind control toy/gimmick) vs 20 defense rating from tanking glyph.
Eng wins.
Hands-
Reticulated Armor Webbing - 885 armor vs 240 from glove reinforcements.
Eng wins Back-
Flexweave Underlay - +1 agi (and parachute toy/gimmick) vs major agility enchant. Mighty Armor (225 armor) may be top for tanking, perhaps Flexweave
may be situational.
Eng loss, situationally(?) Waist-
Frag Belt - Free cobalt bomb every 6 mins. /shrug But it doesn't conflict with Eternal Belt Buckle.
Eng wins or Pulse Generator - Aside from a 30 yd AoE 3s mechanical unit stun, it's used to trigger
Explosive Decoys. Again, doesnt conflict with Buckle.
Eng wins Feet-
Nitro Boosts - 24 crit rating (plus move speed toy/gimmick). Totally inferior for tanking.
Eng loss All these in addition to explosives, Scrapbots, Jeeves, Wormhole Generator, and some other utility items.
Not too shabby overall.
Edited, Mar 18th 2010 3:02pm by Azaza