Games like Sky Gunner and others that had performance issues (Sky Gunner you had to tell the game to reduce all graphical setting to crap for some stages) on a PS2 seem to get enough power out of the PS3 that you can play at full settings without such a slideshow effect. A new PS2 wont cut it for those situations (admittidly rare).
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PS2 on PS3 in some cases necessary
Games like Sky Gunner and others that had performance issues (Sky Gunner you had to tell the game to reduce all graphical setting to crap for some stages) on a PS2 seem to get enough power out of the PS3 that you can play at full settings without such a slideshow effect. A new PS2 wont cut it for those situations (admittidly rare).