I'm using Potenza G3 too for about a month, to say it sucks is wrong, but don't expect u can do anything with this tyre. IMO it has very good dry grip & good wet grip too.
BTW, the best street tyre from Bridgestone is not Potenza G3, but Potenza S03 Pole Position.
Goodear Eagle F1 GSD is the best wet tyre, but average dry grip. This is Autocar's conclusion on their previous tyre shoot-out article (all the tyres are tested on track, so it should be very objective assessment).
I never use Yokohama so cannot comment, but Satria R3 using Yokohama tyres can lap Sepang below 3 minutes, very impressive indeed, and yes, new Lotus Elise uses Yokohama too.