Mellanox Switches were easier before Nvidia bought Mellanox and then their new version of the operating system changed. They started with Ennui, and now they only use Linux. If they returned to their previous CLI it would be a good option for starters. The new CLI is more difficult to use but more powerful than the older one. It has its advantages.

The configuration is a bit different from Cisco, and therefore, for me at least, there's a bit of a learning curve. I'd like it to be a bit easier. It's one thing they could improve on. 

The installation process can be a bit difficult.

Mellanox Switches could improve by adding some features that can make it easier for integrating the switches in some managing and monitoring platforms, such as Elastic or similar software for monitoring data with the data center in a more holistic way.

If you compare this solution with Cisco, utilization in Cisco is more popular and it is more friendly. It's the experience and the responding ability of the document training.

The training documentation can be improved.

The scalability is working fine at the moment, but there's always room for improvement. As of right now, I don't know of any improvements to suggest.