For those of us that make IP networking our livelihood, yes, we're serious about Juniper being the best. While they're not flawless by any stretch, Juni has tried to do very few things and do them phenomenally well. That vs. Cisco which tries to do everything, and does them fairly poorly.
If I had to dig at Juni, it would be their hardware production isn't as tight as Cisco's. I've certainly seen more cases of "infant mortality" and "DOA" hardware from Juniper than I have from Cisco in my years of doing this stuff. Their strength is their nearly bullet-proof network operating system (which runs atop BSD.. that doesn't suck). With JUNOS, I've been able to do things with a router that shouldn't be possible or legal, but it works and just keeps on chugging along, routing packets.
Cisco's IOS is a turd, has always been a turd, and always will be a turd. They can polish it up all they want, but in the end, it's still a stinky turd. Unfortunately, they have a market share second to none. So we make do.