Well if you guys didn't know THQ is selling some ips and Vigil Games is part of THQ. Vigil Games makes the Darksiders ip so its being sold and no one has bought it yet. Platinum Games are interested but I think Sony should buy it just to add to its already great exclusive lineup and not to mention War and/or Death in PSASBR would just be amazing.
After their last exclusives didn't sell, no they shouldn't. If anything, I wish half their exclusives went multiplat since they don't deserved them.
The only exclusive THQ games were Wii games that no other company wanted, and they were all bad. There were also the PC exclusives which are fine on the PC. I couldn't possibly guess what series you could be talking about.