Two things:
2. The time it takes to cast rituals is way out of whack.
Casting times being a minimum of 10 minutes is crazy, especially for simple things. I'll go back to Wizard's Curtain (this is a good one to flog). In 3.X, this would have easily been a level 1 spell with a casting time of a standard (or maybe a move) action. This effect probably would have lasted an hour a level. This would be an excellent spell for a wizard to gain a little privacy very fast.
In 4E though, it just becomes silly. Want some fast privacy, you'd probably be better off making stealth checks. They cost less and are effective immediately. Waiting around 10 minutes to get some privacy may not be reasonable in many cases.
Leaving the monetary costs aside... why is 10 minutes for even mundane stuff crazy?
Using your Wizard's Curtain ritual... I recent put up blinds and curtains in my house, and it easily took around 45 minutes (2-3 windows) (if you include gathering tools, measuring, etc...) and I'll admit, I've very little in the way of general handyman skills, so they're probably not perfect. A wizard being able to gather his thoughts, reach into his pocket for reagents, speak some arcane words, and being able to summon (4? I'm not familiar with the ritual) curtains ("perfectly" hung no less, with no handyman skills required), does not seem too bad to me - it's still far faster than manual labor.
The new Unseen Servant - I spend 10 minutes and then it can clean my house all day, instead of me huffing and puffing? I'll make that trade, even if it means I can't pull the old "have unseen servant drop rocks on enemies"... you know, unless I'm well prepared. 'Twould be nice if Unseen Servant mentioned what sort of action is needed to give a servant a command though, in case they're around during a combat.