Let's see...my favorite is Bad Religion. I also like Letter Kills, Rancid, Lars Frederiksen and the Bastards, Flogging Molly, Descendents, Dropkick Murphys, Weezer, Goo Goo Dolls, IMA Robot, and Fugazi.
I don't hate too many bands, I'm pretty open-minded, but I despise New Found Glory, HIlary Duff, and hip-hop/rap. But that's just me. I'm not gonna say you should like certain bands and hate others, because everyone's entitled to their own opinion...right?