I've been happy with my Weber kettle but of course that's a simple charcoal device, not a gas grill. I will say that Weber makes a quality product. I have a gas grill from Char-broil also. It's about 8-10 years old and holding its own.
I think in the end it's a question of getting what you pay for.
Gas BBQ Grills Reviews: Product Reviews Comparison Reports has the Genesis rated at the top.