Swain ramblings by a skrub that mains him
Alright, so I've mained Swain since URF 2015 (he was free that week) and played almost exclusively him to the end of the season, then gave up with the s6 nerfs. With 6.10, I picked him up again, and I can say:
- he's overall fine/on the strong side
- he has significantly strong and weak situations, he sometimes feels powerless at lvl 2-5 but then unkillable at 6 or when he gets
or 
- he has much more waveclear lategame, with Q executing minions and swapping targets, R having more crows and possibly also Sunfire and a couple MPen items
- he gets rekt if you have lots of waveclear in the first few levels
- the less reliable Q makes it much harder to land W at any stage of the game except teamfights.
- he still goes OOM instantly if he doesn't get focused and can't use the Eternity passive of Catalyst.
I don't have much more to say, I'd just want to talk about our lord and saviour Birbdoode with others that have a bit more insight :D