Doncaster flattered to deceive when going down to a 30-4 Championship defeat against in-form London Broncos at Castle Park.
Despite trailing 10-4 at half-time they had done enough to suggest they could finally get off the mark in 2015 after 16 successive league defeats.
“I’m a bit disappointed because I thought we let London off the hook really,” said new head coach Gary Thornton.
“We were in the game at half-time. We spent a lot of time near their try line and should have taken more chances. We were unlucky to come in behind.
“So there were positives but once again in the second half we made some really poor decisions when we were attacking near their line and we need to be a bit smarter. We also gifted them some really soft tries at the end.
“The spirit is here but we are missing quality in execution but that will come with more training sessions.
“We’ve only trained together for a few sessions (since I took charge) and we had a new half-back pairing in Richard Wilkinson, back from injury, and new signing Paul Mennell.
“Mennell had a great debut. He’s not played since January so did well to last the pace against a full-time team.
The club will being without prop Matt Groat - up before the RFL disciplinary - for Friday’s game at Featherstone, and Shaun Leaf (head injury) who lasted only a couple of minutes yesterday after coming on as sub.