He resigned his office in disgrace and his name has been poison for 40 years. Any good things he did was overshadowed by Watergate and it's proving unlikely that history is going to be any kinder to him than has already been.
Presidents these days look to legacies to see that they're remembered well. Clinton is, Reagan is still a tossup (Republican slobbering is the only reason he's remembered well at all), there's an attempt to rehabilitate W's disastrous time which isn't really succeeding. Nixon's legacy is ruined.
Worse, turned the Republican party into a group of people that saw what happened, seethed with rage, and turned into a party that just wanted revenge in any way possible. Most of the poisonous things they've done since then (Clinton's impeachment, the "NO" response to Obama, etc.) have all been a direct result of that action. It didn't start with Nixon (see how JFK was treated during the 1960 election) but his legacy remains with us in all but a good way. Sad, really, for the party of Lincoln and Eisenhower to turn into the party of Tom Cotton.
But you're thinking I meant legal consequences. There's more than that to consider.