ANH Obi-wan was supposed to be the strongest jedi during ANH and he lost to Vader, think about this. Obi-Wan is even stronger than he was in rots and he couldnt beat vader. So vader obv did not suck if he did he would be pwned by obi. and he wasnt pwned. in fact vader said that obi was weak. so vader must of had considerable strength. and Luke is even stronger than either of them, i am sure obi-wan would let himself get killed if he didnt believe that luke was stronger than himself, yoda, and darth, and the emperor. So Luke Rocks!