I thought it was
. >_>
Sure, you can get Swain low, but once you get him to 0, he's dead. That's it. Sure, if he gets to 10%, he can maybe get a bit higher before being forced out by the thing that brought him that low to begin with, but he's not going to go from even 10% to 100% in seconds without either: A.) Recalling or B.) standing in the middle of several enemy champions while taking no damage from any of them. Yes, I know he can heal while using Zhonya's, but that's still not enough time for him to get all the way back to 100%.
Also, no, I am not a Swain main defending him, just someone that knows the basics of how he works. I've played him a few times, found him not to my style, and moved on. I've also fought him quite a few times, and have been able to beat him in 90% of those games by playing intelligently.