I'd heard that Brick was great, and I liked it okay. It's more fun if you're familiar with film noir and hard-boiled detective stories, so you can figure out the slang and pick up on the classic plots and character types. It's a little odd to see modern teenagers speaking like characters from The Maltese Falcon, but I guess that's part of the charm.
Happy, Texas is just goofy. The plot is fairly predictable, but Steve Zahn and William H. Macy (one half of the infamous Filliam H. Muffman!) are a riot. I usually don't like to watch Ileana Douglas (her eyes kind of bug out), but I didn't mind her in this.