I have had two WordPress blogs hacked into in the past. That was at a time when I was doing very little internet marketing, and until I found time to address the situation (months later), these sites were penalised in the search engines. They were not removed, but the rankings were reduced.
Allow me to shoot a few scare tactics your way since scare tactics appear to be what drives some people to take repair hacked wordpress site a little more seriously, or at least start thinking about the problem.
No software system is resistant to bugs and vulnerabilities. Security holes will be found and men will do their best to exploit them. Keeping your software up-to-date is a good way to stave off attacks, because reliable software vendors will mend their products once security holes are found.
Recently, an unknown hacker hacked the blog of Reuters and published a news article. Since Reuters is a news site, their reputation check here is already destroyed due to what the hacker did. Something similar may happen to you if you do not pay attention on the security of your WordPress blog.
It is really sexy to fan the flames of fear. That's what journalists and bloggers and politicians and public figures do. It's great for readership and it brings money. Balderdash.
Just make sure you decide on a plugin that's current with release and the current version of WordPress, and which you can schedule, restore and replicate.