Spierling and Thomas Hemi scored the other Wairarapa United goals in a performance which mirrored many of their other efforts in 2014, a mixture of good and indifferent.
"We were up 2-0 at halftime and pretty much all over them but the second half was ordinary," Spierling said.
"We let our guard down and they came back to 2-2 but fortunately we had the last say with a third goal in the last few minutes. Overall we probably did enough to deserve the win but we still weren't consistent enough, there were too many mistakes."
Memorable as Watson's goal was he was not given his team's player of the match award. Instead it went to goalkeeper Matt Borren who made several saves during the game, particularly in the second half.
"Matt was terrific, he was put under a lot of pressure at times and he responded really well," Spierling said.
This Saturday, Wairarapa United are scheduled to play Western Suburbs at Maidstone Park and Spierling is anticipating spirited opposition from a Wests line-up who have a reputation for playing a possession-based game.
"They can frustrate the hell out of you ... they put a lot of emphasis on retaining the ball for long periods and waiting for something to give."
Wairarapa United are fourth on the league table with 18 points, just one place and one point ahead of Wests.
