1) Reforge your current chest, bracers, mace, and Ring of Frozen Rain: crit > mastery
2) Heroic instance upgrades include: Shoulders- Mantle of Loss from SFK, Trinket: Blood of Iseset, and there are a couple of options for better rings for you instead of that PVP ring.
3) There are several Valor Point items that you should be trying to acquire: Helm- Mask of New Snow (easily pre-raiding BiS), Ring- Twined Band of Flowers, Trinket- Core of Ripeness, and Legs- Leggings of Charity. These are all big upgrades to what you have now so I would really focus on VP farming.
4) The Hyjal rep belt is BiS, you should make that a priority. Put a rep tabard on- it helps with rep grinding a lot!
5) You can also farm two nice items, a ring and a trinket (both slots you have weak items in currently) with Archaeology.
Your gems and enchants look fine however at your gear and raid level I would go with int/mastery over int/haste gems for the yellow slots.
I'm guessing it was the combination of the bad stats, i.e. too much crit and haste and too little mastery, PVP gear, and the lack of raid experience that caused them to decline you. You can fix the first two with a little work on your part. Good luck.