My salmon burgers are bland
I would squeeze a lemon over the fish when it was done, and then make a sauce for it. You can do like an Aioli or flavored mayonnaise, using ingredients such as capers, dill, lemon etc.. whatever you would normally like on regular cooked salmon. 

Also, you will find a difference in taste between a farm raised and wild-caught salmon. Wild caught salmon have redder flesh (although some places have started dyeing farmed salmon), and have a much stronger salmon flavor than farm raised salmon.