Ryan said after the 22-9 reverse: "We didn't manage the game well enough in the difficult conditions.
"We came second in the set-piece, lacked discipline and showed how vulnerable we can be.
"We are really disappointed with that performance. We are not giving up but we have to get a win on board as it all becomes a bit hollow."
It was a very poor performance from the Warriors, who could only manage three penalties from Chris Pennell - but despite this Ryan was not totally downbeat.
He continued: "This was the Worcester of six to seven weeks ago but I'm not questioning the commitment of the players.
"We've come here to rebuild this club but it's a long term process and can't be judged on a week to week basis - but we have to learn from our mistakes."
Irish boss, Brian Smith applauded the performance of the referee, which contributed to his side's success.
He said: "We had a plan to obtain territory and squeeze them with our driving game.
"We left six points out there before the interval but Wayne Barnes was accurate in penalising their offences against our driving maul and we were rewarded."
It was a poor game as both sides lacked any attacking invention with only one try scored.
Smith said: "Topsy Ojo didn't touch the ball at all as it was our plan just to have our half-backs and James O'Connor kicking the ball."
O'Connor was the hero for the hosts, scoring all his team's points and drawing huge praise from his coach.
Smith added: "He's a world class player and should be playing for his country.
"He'll go back to Australia in January 2015 to put his hand up for a Wallabies Test place.
"We have him until the end of the season but we'll be really fortunate if we can have him after that.
"There is massive money in Japan and France, who are throwing ridiculous money at players. French clubs are paying double and can blow you out of the water."