It is a good deck but weak vs very agressive ones for the lack of mass removal and healing, but look for this side, you have much more chances to win vs control warrior than the rogues, if this deck appears too often the CW will come back very soon.
The newer Rogue deck, which is being classified by some as Tempo Rogue, is actually just a full-on aggro list. (Tempo is often considered to be the faster end of midrange, but any speedy Rogue deck will tend to be slapped with the Tempo label.)
This aggressive Rogue deck is very likely to beat Singleton Hunter most of the time, so what you reported is quite normal.
It doesn't mean Singleton Hunter is dead; it just means this is not a good match-up for it. You will still be just fine against control and combo decks. In particular, Control Warrior is still out there, and we need you to keep it in check.
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Seems like the main win condition is a combo of questing explorer with sorcerer's apprentice and a large cycle of zero- or one-mana cards (helped by magic trick). I managed to achieve this on turn 4 against Paladin getting a 9/9 explore....www.98steps.com