I think the modifications to the infusion system on the weapons is perfect. But with gear you are not able to infuse a helmet from a Titan into a helmet of a Warlock or Hunter. The item is called a helmet and is the same class item just character specific. This should be corrected.
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I disagree on weapons, D1 was better in that it didn't have to be an exact match to infuse. It's been crippled to slow down progress, nothing more.