Wrong, most games utilize 4 cores which is why the i5 4690k is the sweetspot.
Yeah, but the advantage between 2 and 4 cores isn't that huge. Tom's hardware did a review with benchmarks and it depends on the game but it wasn't a huge difference.
I'm more likely to go down the i7 road anyway because I'll be running CAD software and FEA really benefits from the extra cores and hyperthreading.
^^ there is some utilization for multiple cores, however it all depends on the game. For all we know the OP can be playing TF2.
Bottlenecks will be applied depending on the game. You answer can be correct, but it can also be incorrect.
Haven't played anything too new. Bioshock Infinite at 1080p on ultra doesn't drop below 60 fps. Same thing for Dishonoured. I've been pretty busy and haven't got anything newer in my Steam Library.
He spelt the UK, AUS, CAN, and NZ way.