No no no no no. OpenOffice is the worst pile of useless rubbish I have ever used. I used it to avoid paying for Office and it was terrible. Last time I looked the interface looked dated. It doesn't have a lot of fairly common fonts. It may save in .doc but it isn't worth it, I opened .doc files from Open Office in Office and the formatting was ruined, the table wizard is useless. The version of Excel and Powerpoint are terrible. When I used it wouldn't save or open .docx files. And their version of Access is entirely incompatible with proper Access.
DO NOT USE OPEN OFFICE. Pay for Office and save yourself a pile of hassle.
It is a bit dated, but nothing you can't fix yourself.
Interface is easy enough, and while it looks dated, it's nothing that makes it worth it to spend cash on office.
Fonts can be downloaded easily, so that isn't really an issue.
Formatting gets ruined, I will admit this.
Their version is Excel is excellent, I use it all the time. I don't have much experience with powerpoint, but it has worked fine for me in the past.
And I don't use Access, so I don't know much about Openoffice' version