I have been wanting to play commander / edh for awhile now and with next weekend being a big convention where I know lots of people play, I bought the Arcane Wizardry from this year as well as ordered the Commander Anthology. The decklists seem very well put together to me, not really being familiar with the format.
Majority of the decks that you bought have very clear themes and strategies. The elf deck and the graveyard deck are very strong. The wizard deck also has a great feel to it out of the box. The other 3 color decks in the anthology are good, but suffer from poor focus on the strategy. The black green graveyard deck can keep up with competitive decks.
As long as you dont intend to play "competitive EDH" then they are all very reasonable. As hippo said, some of the decks are better than others but taking one to your LGS will enable you to have a reasonable game with most people.
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EDH BRGKresh the BloodbraidedBRG, A box of lands and ideas.
Modern: RG Titanshift. A deck made of cards too stupid for EDH.
Retired: Lots. More than I feel you should suffer through or I should type out.
Some are good others not so much. Never expect to win a competitive game with them, a Pre-con will seldom win against a finely tuned EDH deck. In most cases you will want to tweak them. Either by fixing the mana base or just getting better cards for some that just don't work in your deck. (I bought the dragon deck and removed O-kagachi, Vengeful Kami. it just did not work in my deck.)
Now that said, don't just go buy any pre-con either. Make sure it is a pre-con that has A general (or cards) that fits your needs and desires.
They are a great starting point. They need tweaking to be able to keep up with decks constructed by players. The Black/Green deck with Meren is one of the better ones and can be pretty damn good out of the box. Since you are new to the format they will be pretty valuable as learning experiences for deck construction and improvement, it shouldn't take many games before you begin to see the weak spots in them, which will help when you begin to build your own decks. EDHREC is an amazing resource when combined with our own Decklist Database.
BRGKresh the BloodbraidedBRG, A box of lands and ideas.
Modern:
RG Titanshift. A deck made of cards too stupid for EDH.
Retired: Lots. More than I feel you should suffer through or I should type out.
Now that said, don't just go buy any pre-con either. Make sure it is a pre-con that has A general (or cards) that fits your needs and desires.
UB Vela the Night-Clad BUDecklist
WBG Ghave, Guru of Spores GBW
WUBRGThe Ur-DragonWUBRGDecklist
amazingly epic sig courtesy of DarkNightCavalier at Heroes of the Planes.