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PS2 outputs at 480i (640x480 interlaced), but PCSX2 can force the games to render at much higher resolutions. If you also have a fast video card, you can make the games look a hell of a lot better than the PS2 is capable of.
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3.2GHz Athlon X2 and some speed hacks in PCSX2 got Guitar Hero II up to full speed, I'm happy to say. Your system needs to be extremely fast to emulate Guitar Hero, it's a lot harsher on system requirements than a lot of other games for some reason. If you have a fast system (dual core processor over 3GHz) you can try to emulate a PS2 and run the older games on the PC that way. After Guitar Hero III came out for the PC I imported all of the songs I liked from GH1, GH2, and Rock the 80's into Guitar Hero III.
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