oh man there are so many...

star tropics
Tecmo Bowl
gunsmoke
a boy and his blob
zelda
mike tysons punch out
super mario 1,2,3
batman
teenage mutant ninja turtles 1,2,3
Maniac Mansion
Friday the 13th
RBI Baseball
Baseball Stars
Double Dragon 1,2 (not 3)
Blades of Steel
Dusty Diamond's all star softball (extremely rare, costs like 50 bucks + on Ebay)
The goonies II
Final Fantasy
Jaws
Megaman 1-7
River City Ransom

Man I'm blazed so that's all I can think of right now. But trust me there are hundreds of good games out there for NES.