A file server that can serve over NFS & CIFS, whilst simultaneously be able to serve block traffic over FC, SAS and 10/40gig ethernet. With snapshots, decent performance, and once setup, can be left for 3 years (at which point its either too small or needs a new maintenance contract.)
Nimble, they can do small, cheap and easy to configure. But they can't do fast(unless you are just doing small VMs), they can only do block storage, and FC is a beta product. No real HA.
Pure, Fast, but limited to 250tbs. No metrosync. Block only.
nutanix needs infrastructure upgrade to work at any decent speed. Limited to VM storage. (I think there is a licensing cost for that from VMware too. )
However that's not to say that netapp are the only show in town. They can be utterly shit for many tasks. More importantly, if you let them, they'll bleed you dry. Most people reading this, will never need a system that does block and file storage. But medium sized boring companies need them.
IBM with GPFS have an interesting product, its just marketed and supported by morons. Its fairly simple to create a global file system, with geographic data affinity, that scale linearly when you throw hardware at it. It seriously is amazing. If it wasn't so held back by IBM, you could have a simple globally shared filesystem across your entire cloud infrastructure, that's fast (unlike EBS/EFS/S3)
Object storage is another matter. Object storage is another way of saying that globally coherent fast posix file access is hard, so here's some thin layers over a keyvalue store, you do the rest.
Some people do it right (S3, cleversafe) A lot of people do it wrong. There are important tradeoffs, Like latency, data affinity, or mutability of data. Like a Netapp, no one system will do everything at the right price.