Just some initial thoughts after the beta test release...
A Team of Bruisers - Having 5 Guards with an Orx Strength is no joke. These guys hit like a ton of bricks. Every single Rush you should be Slamming a couple of opposing players. This team is not for the timid.
Pitch Perfect - Harmonics is a very strange ability, it definitely has some depth to it. Having the plus to Movement in most cases is a must. The extra dice to Speed comes in handy more often than I would have initially thought, and when you can get the extra dice on Strength for the Slam, that is amazing.
Defensive Chops - With the right setup, defending your side of the pitch is made easier by the Harmonics ability. Spacing your players to grant bonuses to other players is key. Knowing the capabilities of your opponent will help you know whether to set up for the blocking of the front 1-2 point zones or blocking the 1-2 centers and crowding the 3-4.
No Strikers - Well, scoring is not easy with the Crystallans. A jacks only team is a challenge, but this is not an insurmountable obstacle, I mean look at the Orx. :-)
Clumping - If you are not careful, you will find your players clumped together. An astute opponent will try to get you to maneuver your players into areas that will handicap your ability to defend. This is also made even more difficult by one's own brain constantly saying, "Yeah, but 6 dice Slams!"
They Are Big Rock Guys - Terrible Speed and Movement. Now these are mitigated by the Harmonics, but you cannot rely on it all the time.
I am going to wait on this until I can see the Crystallan MVP and the other Season 5/6 MVPs are capable of.
Don't fall into the trap of HAVING to have full Harmonics on everything you do. Crystallan Guards are utterly amazing BEFORE the extra dice from Harmonics. Take advantage of the single bump from Harmonics that 1 other Crystallans near you grants, this is a great advantage in and of itself. Use the plus to Speed to keep your players safe from those in the back Slams, and when you need to Steal (but you had better be Threatening the ballholder with at least one other Crystallan too!). If you are willing to put in the time on the Sulentic Shards, I have a feeling that the reward will proportional. If you are a fan of the Orx from Season One, I think you might enjoy the Crystallans.