Just got done with a winnable game...

So there I am. vs . My first reaction is, "His ignite is going to be the death of me." Fast-forward 10 minutes in and I've swept the floor with this man. Like, duo jg first blood, 3-4 kills and first turret in another 3 minutes. Of course, our bot lane isn't doing so hot so I go help them take two turrets, secure a drag, and even shut down a pesky . Look up in top lane and see that trynd is just afk farming and taking my first turret. "No problem. I'll go back and finish him up." Now being 7/1/4 with around 3 or 4 completed items and some armor. I think I stand a pretty good chance against a champ who is going 1/5/0 at the time who only has 2 completed items at the time. His only redeeming factor is that he has 200 farm, not unlike myself. And just because we all know can be bs at times, my jg and decide to help me since they're in the area. But apparently, having 3 people hound on a champion who hasn't built a shred of bonus health or resistances is a futile ordeal. One triple kill later and I'm questioning what went wrong. Was it the combination of conqueror, true dmg items, and passive crit that did us in and the fact that all he had to do was press R to survive it? Probably.

What I want to know is if THAT is considered ok? Because if so. Why?