Forgettable but entertaining. Mitchell likes his romantic comedies to have meat & bones and maybe Morning Glory was the experiment that paved way for some of his most interesting works. The script deserved a bit more development because you can feel it wants to be deeper than that, but it still works. Then we have Rachel McAdams overdoing it while the rest of the cast pushed some serious autopilot buttons.
In Broadcast News, we sympathized with Holly Hunter's drive to maintain the respectability of the nightly news. Now, 25 years later, we're supposed to sympathize with Rachel McAdams' attempts to turn a respected newsman into a buffoon and bring the standards of a morning show as low as they can possibly go. Still, mildly entertaining if you don't think about it.