I have to disagree with the negative reviews, I believe that the food and service at the Thai House at 7th and Burrard are fantastic.
The best peanut sauce I have ever tasted. Excellent Satay, and all the curry dishes are very flavourful, in particular the green (#23) and yellow with bamboo shoots. Also try the spicy szechuan green beans with chicken. And the sweet and sour vegetables. I think their weekend all-you-can-eat is one of the best dining deals in Vancouver. I don't care for the Pad Thai, but it is one of very few dishes that I wouldn't order happily.
Service: It's never been bad for me. I find the servers to be very attentive, you can't get halfway through a glass of water before they've filled it again, and the food comes at a good pace. On occasion a dish has seemed a bit slow but I am there at peak times and have never been seriously inconvenienced. I find the servers quiet and respectful but I always chalked that up to culture, not draconian management.
Ambience: It's alright, nothing overly brilliant but nothing bad. I have often wondered about the karaoke equipment myself, but it's always been dormant when I've been there so we manage to co-exist. The interior is pleasant and clean, and doesn't detract from the eating experience.
Maybe it's not the most authentic, I don't know. But if you like spicy and flavourful food at a good price, I would check it out and decide for yourself if it's worth a return visit.