Wasps director of rugby Dai Young believes his side can still improve despite their 43-14 win over London Irish at Adams Park on Saturday.
Despite the emphatic win, Wasps had to come from behind after trailing 11-9 at half-time and Young bemoaned his side's first-half effort.
"First half was pretty disappointing," he said.
"Up front we failed to get any platform in the scrum and line-out.
"We were second best in most departments. In attack we failed to hold the ball for any length of period to build any pressure and momentum.
"Coming in at half-time, the dressing room wasn't a very happy place to be.
"We had to step up in every department and we did. The second half we looked a completely different team.
"We were far more potent with the ball in hand, defensively we looked far stronger and the forwards stepped up.
"We looked a far more complete team. I thought we deserved to win but the bonus point probably flattered us."
Despite their defeat, London Irish director of rugby Brian Smith believes his team will improve.
"There's no reason to panic. It's early doors in this competition.
"We went in with our tails in front at half-time but we dropped off the pace 55 minutes into the game. That's really disappointing. But we have to cop it on the chin."