What I've learned on BSN is that the Juggernaut, one of my favourite and first kits, only turns into a Puggernaut when played badly - usually by Pugs, hence the name. Admittedly, I play the Big Juggs quite aggressively (siege pulse galore hello), and I've seen also many oldtimers use him on gold and platinum similarly. He's not merely a tank (although is good at it) but can be successfully handled.
Slooooowwww, yes, but I've found him a great kit to start learning the whole game when I started out.
In PUG matches though, one wouldn't imagine him being that slow at all (even without any adrenaline mods), as I've managed to get to all devices many times before any of the Pugs... Go figure. 
I used to use him a lot more around a year ago.
Despite trying the siege pulse build and making it work, I actually still love to tank on him. I played WoW for a looooong time, and that mentality of Heals/DPS/Tank still comes out occasionally.
Given most of my games are with Pugs on Plat, I've found on PC in the past year or so, that pugs are really quite good. If I had to ballpark a stat I'd guesstimate around 75% of the pugs I play with I'd consider playing with again.
Now all that being said, my point is, I still play my jug as a tank. And I like tanking for random pugs.
I love it when I get a "following" behind me. (Happens on my Paladin too) I honestly believe there's a certain skill to properly tanking. That's where most puggernauts die out. They aren't mobile in their tanking strategies and they don't know the maps well enough to backwards walk from RHA to RHA. They also don't know how to line up a choke point for their allies to AoE the enemy into a hot mess.
If I'm with highly competent players there isn't any need for a tank and I'll roll with something faster, but when pugging I find it fun to get a group going. Particularly since it's the mute master race. Teamwork without verbal communication can be rewarding. (Albeit rare...)