ANC - Bitcoin already can connect through Tor. Coin Control is a good idea, but it isn't a protocol modification and doesn't require a new currency.
MEC - Probably made by an art student. All that it looks like was changed was the block rewards (doubled) and a flashy website was made for it.
BTB - PPC except "super rare" (in other words the creator has no idea how economics works)
GRC - LTC except centralized. You're better off donating your processing power to BOINC and mining LTC at the same time than supporting this centralized scamcoin.
TL;DR: Buy coins that have actual features and aren't premined or centralized (BTC, NMC).
MEC- Solid dev. One of the only scrypt coins not based on litecoin. Kimoto converted one of the newest beta versions of bitcoin himself. Also sports a very innovative difficulty algorithm and coinjoin is going to be added. (coinjoin > zerocoin) Sick looking wallet too. Amazing community support. Lots of thing going on behind the scenes if you care to do some research.
ANC - Solid devs, strong I2P support, working on adding coinjoin.
BTB - agree.
GRC- see my above posts. It also has pop3 email and a p2p pool built into the client.
Solid dev isn't a feature.
One of the only scrypt coins not based on Litecoin isn't a feature, scrypt is, but that is already in another coin.
"Also sports a very innovative difficulty algorithm" - Will look into this
"coinjoin is going to be added" coinjoin can be added to any cryptocurrency. It won't be unique to this currency.
"Lots of thing going on behind the scenes if you care to do some research. " - Anything actually changing the currency? Or is it something that can be applied to any currency.
"strong I2P support" - Good feature, but creating a new currency isn't required for this. It could just as easily be a Bitcoin client, but the devs didn't get in on Bitcoin early so they are making their own currency and hoping it is pumped.
"pop3 email and a p2p pool built into the client" - These don't require creating a new currency, you could just as easily make a new client, see my previous comment.