I recall a few years back that they had a LTS release with a beta version of Firefox that was broken, broken Pulse Audio, and even worse, a bad binary blob in the Intel gigabit NIC drivers that would permanently brick your NIC if you loaded the driver.
LTS releases are supported longer, but that doesn't make them more stable on day one. Nor does it change the fact that the packages get the same polish the other fairly bleeding edge Ubuntu releases get.
Red Hat and Debian Stable seem to be overly cautious with sticking with old packages forever for "stability", even if known bugs exist in old packages. Ubuntu is very bleeding edge sometimes at the cost of stability.
I think there needs to be a fairly sane middle ground where each package gets reasonable polish, but you also get newer packages out somewhat quickly. But that takes a lot of package maintainers.