So far Excel is pretty good although it annoyingly changed careful formatting on a budget spreadsheet I use regularly. I haven't tried PP or Word yet. To be fair I'm running Micro$oft's beta software on Apple beta OS, 10.10.3
Strangely I'd have said that Office 2011 was Microsoft's best (and best supported) product for Mac for years. I'm a regular user and Outlook 2011 is the best integrated diary-appointments-email-contacts-reminder app by a long shot IMO. Maybe it's idiosyncrasies suit me and my style of working!
The MS servers are ultra busy by all accounts. I must have beaten the rush. The D/L is only a relatively modest 2.65GB but the whole world seems to want it.