When I used a Mac as my primary device, I relied on Office for Mac and it always ran well. I never had problems with it. The only issue was the lack of Visio, which I replaced with Omnigraffle.

Disclosure: I work for Microsoft, though this experience was at a previous employer.

This has been my experience too -- everything works reasonably well, I'm pleased with it. It's not always pretty (and I'm frustrated that some keyboard shortcuts don't work like they ought to) but it's always run properly.

Microsoft Outlook for Mac (the newer "blue" one, v15.3) is actually my favorite mail client on the mac. It's basically exactly what I wanted -- I wish there was a Windows version of the Mac Outlook :)

I've been pretty happy with MS Office for Mac over the past few years.

I've seen bugs in Word and Excel

Sometimes Words starts typing multiple lines and Excel freezes when copy pasting filtered cells. I've learned to work around these bugs, (having been there for over a year). Maybe Office for Mac is not be coded by the devil, but lacks features and is unsatisfactory in ways that make me consider turning on the PC

I always think about the tough state of existence for the "iTunes for Windows" and "Office for Mac" dev teams.

I'm sure they get no support from corporate IT, their company's marketing constantly makes fun of their chosen field of expertise, and they probably even have their own table in the cafeteria. :(