The gear sets are a real shift change for Destiny. It's the first time it's happened and one of the few things that the other looter shooter models had but this didn't.
I love everything about the new armour sets. The different colours, the roles they link to and how to get them sounds an interesting play loop which could be great to group up and tackle together.
The perks of the armour too sounds ace. For example, the Collector can collect 20 motes instead of 15. If that is banked, a huge new Taken blocker is sent across. The Invader can block the bank AND steal motes. Sentry can see where the invader is (I believe) and the Reaper can clear enemies far quicker than anyone else.
Whilst it is Gambit sets, this is a good start to test them. This could open the door to all kind of sets to go after if they create them. Definitely worth a try imo.