But Dai Young's men found their feet in Europe, with a record-breaking 90-17 success at Viadana followed by a hard-fought but ultimately comfortable 26-10 win at home to Bayonne.
Wasps scored 14 tries in their Italian victory before cementing top spot in Pool 4 by ending Bayonne's own winning start to the Amlin Challenge Cup season with a strong second-half showing at Adams Park.
They have since taken that confidence back into domestic affairs to beat reigning English Champions and perennial rivals Leicester Tigers last time out.
And Haskell, who returned from knee surgery in the win over Bayonne, is delighted that he and his colleagues appear to be back on the right track once more.
"It was important that we backed up our performances in Europe with a win going back into the Premiership," said Haskell.
"It was important just to get back winning. Any sportsman will tell you that the world is a better place when you come in on a Monday having won.
"We need to start doing ourselves justice because we have lost by narrow margins to some good teams but we should have won some games that we haven't. To beat a side of the calibre of Leicester, albeit missing some internationals, is very important for this Club."
Next up for Wasps in the Amlin Challenge Cup is a December double header with Grenoble but first on the agenda is Saturday's Aviva Premiership game at Gloucester.
A fourth successive win could see them jump back into the Heineken Cup places for next season, but defeat may mean they drop as low as 11th in the table ahead of a two-week break for LV= Cup action.
"Gloucester are a very good side and have some of the most dangerous young players in the game. It's important that we respect everything they do - they have some big forwards, a strong back row and a very dangerous back three," added Haskell.
"We have to be very careful, but we are a team that must maintain a focus on ourselves, making sure that we get our own game plan in place. At times this season, we have been our own worst enemies.
"We do have confidence in our ability and believe that we can go and beat these sides. If you get beaten by a better team on the day then fair enough, but if you look back at the games we have lost this season, often by narrow margins, the error count has been too high and that is even more frustrating.
"There is always a lot of talk about the potential this side has but we want to make sure that we make that come to fruition."