Different strokes for different folks. If you want complete control, then Dreamhost PS is not for you.
If you want the ease of managed apps like you get from the Dreamhost control panel and managed apps and control over the amount of dedicated memory and CPU, then Dreamhost offers that for you. If you also want to run server processes, then Dreamhost is for you as well.
Apparently now, if you want to futz around with root access, then Dreamhost is for you as well.
I can understand how if you want to do a close-to-hardware-level OS install from scratch, you might want to choose a different VPS provider, though.
For me, Dreamhost PS provides exactly the amount of control I want and yet saves me the trouble of having to do my own server management. It's an interesting blend of managed hosting and VPS.
Use the [color=#CC0000]3DOM50[/color] promo code for 3 extra lifetime domains and $50 off
More Dreamhost coupons here!