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Alchemy based Artificers should be given more credit, at least for warforged. 
Because Artificers have fantastic out of turn encounter powers and minor action dailies they can spend most of their turns throwing alchemical items with very high accuracy (can get an extra +6 to hit with alchemical items). Warforged built for alchemical items have the added benefit of Alchemical Affinity, which keeps them coated in temps.
Most of the alchemical items aren't that fantastic, but jolt flask makes up for the lack of debuffs that Artificers suffer from.
Warforged Alchemy Artificers are as noted durable (Alchemical Affinity + Alchemical Failsafe).
Alchemy Artificers also have surprising bursts of effectiveness, through Alchemical Failsafe and Quick Admixture.  

It's not the best Artificer, but the buy in is fairly small (except for Alchemist Savant, but it's a decent PP, and great for the build), and is actually pretty effective.

As I read this guide, I'm left with the nagging feeling that the ratings are (deliberately or unintentionally) being slanted to either extreme, and it doesn't do the guide any favors.

  Entries shouldn't routinely consist of everything being rated purple/red except for one or two favored (and gold/blue-rated) items.

Great job so far!  Thanks for building this.

Deva should be sky blue for Wis builds.  I think Memory of a Thousand Lifetimes is just an incredible racial.  Add in Soul of the World at epic, and that's enough for a sky blue imo.

I don't really get the level 1 encounter power ratings.  I just look at that level and see a bunch of similar-to-but-not-as-good-as-Magic-Weapon powers.  To me, Burning Weapons, Spike Wire, and Scouring Weapons are all black (or red/black, black/red).

Add a third vote in for Vampiric Weapons only being regular blue, not sky blue.  If it affected all attacks, it would be better, but it only gets weapon attacks.

I don't think Swift Mender is gold.  There are good theme utilities and skill power utilities, etc., so I think it's difficult to give any utility a gold rating and say you MUST take this.  Seems like it should be sky blue.  Especially since Mark of Healing exists for many artificers who will be reading this guide (not everyone is LFR, a lot of artificers will be playing Eberron campaigns).  It at least needs a note that it's RED if Mark of Healing is allowed, similar to what LDB did for saving throw powers in his warlord guide.

I belive this is mentioned above, but Burning Weapons is meant to be part of a nova round combo with Magic Weapon (and Punishing Eye if possible), so the fact that it's "weaker" than MW shouldn't really be a mark against it.  Particularly at level 1 this combo is just crazygood.