It really depends on the cardstock and your printer. I print holiday cards and gift notecards for a local store that sells them and the "photos" come out great. I use an old Canon i960 inkjet and cardstock from redriver papers - they come out looking fantastic! I typically use the matte cardstock which looks much better for my purpose than the glossy... but have used the glossy for holiday cards which do provide a more "photo quality" result.

My advice is to just try it... but be sure you purchase card stock that is good for ink jet inks... you cannot just use any paper in the inkjet such as posterboard.. the ink won't absorb and will just make a mess on you and your printer. Good Luck!