I like the new gui, but I struggled most of the weekend trying to get it to install on a RAID1 mirrored drive setup. Sheesh - the trouble it gave me! I guess the devs are more focused on eye-candy, and figure that anyone with raid can figure it out for themselves. Even with the Alternate Install disk, I had to manually setup the raid partitions myself before launching the installer.
Linux software RAID or BIOS assisted fakeRAID? If the former, then yes, that's not their target audience at all. The old, alternate installer could do software RAID, LVM, encryption, etc fairly painlessly because it's a port of the Debian installer but I haven't looked at the Ubuntu one in years.
Not sure if Linux supports FakeRaid yet - but I was using soft raid. I understand "target audience", but sheesh, I was using the alternate install disk, and even had to manually apt-get mdadm and go through chroot mounting before I got grub working. Way more trouble than it should have been. I thought most major distros had this working years ago.