You must have dealt with a completely different company and product. The public github is a lot better than the enterprise version at least in terms of stability. Still, both lack a lot of basic issue tracker and code review features.

Github enterprise was a disaster with just a couple hundred users.

Under the load of just a few hundred users it died almost every day. Their support team couldn't figure it out. We had to reboot the servers constantly.

We begged them to add an option to reject force push to master. They refused. We ended up monkey patching their obscured source to add the feature, but it broke on upgrades and was hard to maintain. This is something probably every single customer of theirs wants, and it should take one engineer less than a day to implement.

They only just added side by side diff support. IMHO this is a basic, core feature for any kind of code review workflow. I'm holding my breath for proper syntax highlighting while in diff view.

We've since moved on to Atlassian Stash. While it isn't perfect, it's a dream compared to Github enterprise and a lot less $$$ to boot.