The problem is that MT has the best shared host dashboard control panel out there. The grid shared hosting option historically sucked (can't tell you how many fires I've had to fight because of prolonged grid outages) but damn, that slick control panel makes it so easy to spool up a site for a client in a hurry, or set up a new subdomain that it was worth the pain of periodic unannounced downtime. I loved being able to get a site up on MT Grid in 5 mins flat
If there is anything thats as easy to cruise through and still reliable, I'd love to hear about it.