It depends on what you are accustom to using. I have been using Star Office 7 on my Linux system and it is great. It has almost all of the word processor and spreadsheet capabilities that you would need for an everyday user.
I used it for months when MS Word went 'walkabout', when Word returned I changed back because that was what I was used to. Kept Star Office as my backup in case any of the MS Office programs decide to go 'walkabout'. No complaints about it though. HTH TR
Try Wordpad with a Macro keyboard enhancer. That's fine for most wordprocessing tasks. For anything more complex, use a DTP program like Serif Page Plus. Star Office and Open Office are both fine programs, but I only ever use them if people send me Word documents that I cannot open in Wordpad, or if I need to produce Unicode documents.
Spreadsheets? Page Plus includes a basic table function. Good enough for invoices etc.
Graphics? Page Plus is far more flexible
PDF Files? Publish to PDF from Page Plus
Presentations? Do it with HTML in Page Plus.
Mail Merge? Better stick with Word or Star Office, Page Plus is weaker than MS Works in that area. I still use WordPerfect if I need to do a mail merge.