Rovers had Steven N'Zonzi sent off for a tackle on Laurent Koscielny in the second period but were not made to pay by the Gunners.
The third successive league draw means Arsenal are now seven points off leaders Manchester United, with a game in hand, with Wenger concerned by the flat display.
Worst time in the season for a drop of form. Displays like this will only encourage Man Utd
Arsenal are throwing away easy points , if they continue to do so.. there wouldn't be any challenge for first place.