That was the funnest period of MMA so far for me. UFC was putting on some great events, all their big draws (Brock, GSP, and Andy) were all still active and fighting fairly often. Strikeforce was building their divisions well and putting on really stacked cards, then the tournament popped up and shit got extremely exciting. They were even producing a lot of solid prospect through their Challengers shows (Cormier, Rockhold, Woodley, Rousey, etc). Also, FEDOR! WEC was putting on excellent cards with tons of great fighters. I honestly don't remember ever being disappointed by a WEC card. Dream was Japanese and fantastic. They had freakshow fights, tournaments, some good fighters, and awesome NYE evens It was great having 4 different organizations putting on shows, 4 excellent organizations who all had great things to offer fight fans. I use to think that it would b great if all the fighters from those orgs were in the same place but tbh it's less exciting now that they are. I miss these days a lot. The Pride/UFC era was a blast too, but I feel like the UFC/WEC/SF/Dream era had more to offer.