Ok, GP really is stupid OP
I just played Gangplank top for the first time since the rework. I was against a combo top of Fizz and Teemo, so I was getting pretty much no CS and died twice during the laning phase. Yet, once I completed Trinity force, I was doing 2v1s with ease and ended up leading my team in kills and assists. Those barrels are ridiculously OP once you learn to use them. Heck, I didn't even upgrade my ult at all.
EDIT: Having to laugh at the downvotes despite this being completely factual. Must be players who can only win with freelo champs.