For me, it depends on how well the author pulls it off. In her novel Sea Glass, Anita Shrive has about seven POVs. But all are beautifully done and satisfying. That's not always the case.

In my completed novel, which is currently under submission, I have five POVs and no one has even been bothered by that. But each main or secondary character has a full story or plot of his/her own. The POVs have a reason for existing and I invested the time into developing them.

My WIP is more of a suspense/mystery. I'm writing that from one POV because the entire novel takes place in a matter of days and the only story I am focusing on is that of the main character.

I'm not sure I'd like more than two POVs in a suspense novel. It would require layered plots, which might slow the pace.