Socialisation; I think it's a load of fritz. Kids get socialised all manner of ways, and they don't "need" daycare to do it. Sometimes it is great for them to have other role models for particular behaviour around them, such as drinking from a cup, sleeping on a bed, etc.

One day a week's not enough; also a load of junk. Any good childcare professional should be able to build a good, strong, trusting relationship with your child no matter how long they're in there for.

I wouldn't use it if I didn't have to, but if you do, go for gold and demand what you want and make sure you get it. The service is there to serve you, so be proactive about making this a positive experience. Also, give it time; don't wuss out too early! At least 6 weeks for a once-a-weeker to settle is completely normal.

Goooooood luck!