I would have to say Robert DeNiro is one fine actor. Deffinately my favourite. He has been in lots of movies, not all great but 90% are. Here is my little list of Bob DeNiro movies I think everyone should see.
Godfather 2 (include Al pacino)
Heat (include Al Pacino)(just seen there is a game being made of this film)
Raging bull (include Joe Pesci)
Taxi driver (include Jodie Foster, fine actress)
Men of Honour (include Cuba Gooding jnr, another fine actor)
Shark tale (superb voice acting along with Will Smith)
Mean streets
Casino
Backdraft (DeNiro out-acts everyone, not the best film but he is good in it)
Awakenings (include Robin Williams, amazing actor. If this movie doesnt move you then nothing will. I would put this movie in the top 3 of greatest acted movies ever. Robin Williams is superb, on par with DeNiro if not equal. If you like Willams then I would suggest The Dead poets Society. If Awakenings didnt move you then this will. I burst out in tears the moment Williams first walked into the classroom. He presence in that room and his timidness (is there a word?) was lump in the throat for me.)
There are plenty more but would make the post too long.
See here for a indepth list of DeNiro movies.
http://www.imdb.com/name/nm0000134/
but he missed Labyrinth off the list ha ha!