Of late some unethical people are trying to bring Znets name down by using this review site.
I being a dedicated client of Znet can assure you that all such negative claims however are very general and you can have such issues with almost any provider. However, I can, being a customer myself of shared hosting, never had any problems with Znet. Even once when my site was down in a span of 4 months, their tech had upped it same day though at the end of day owing to volume of calls.
Speaking of hacking, even Google and Amazon and Twitter had DDOS and other hacking attacks recently. No one is safe from hackers.
All in all znet is a great company.