Nothing fundametally wrong with Open Office / Libre Office in a home user / small business environment
I've got several 3-4-5 man companies using it. But all they need are basic word processing and spreadsheets. For that it works fine
I'd be less happy in a larger company, or if they needed more capable spreadsheets - but in that case there could be a case for looking at Lotus Symphony, which is an IBM fork from the Open Office code
Whats also worth thinking about is that if you are upgrading a small network from systems using Office 2003 / XP or earlier, then the training jump to OO / LO is often easier than the jump from old versions of Office to the ribbon-driven 2007/2010