But the R's boss was delighted for Kieron Dyer, who has been plagued by injury during recent seasons but bagged a very late equaliser here, his first goal in top level football since May 2007.
"I tried a few different players today but couldn't really see the goal coming," said Redknapp. "We were a bit short really.
"It was a good finish from Kieron and he got through a full game, which was good. He's kept going and he hasn't played a full game since I don't know when. I'm pleased for him.
"I didn't want to get beat and the draw today, following the win against Chelsea (on Wednesday), is not bad. Losing is a bad habit.
"West Brom are strong and well organised, with a bit of flair. You can see why they are in the top half of the table.
"Maybe the Chelsea game knocked a bit out of our lads. One or two of them looked a bit tired but, credit to them, they kept going."
Redknapp's new signing Tal Ben Haim made his debut in defence but the manager agreed it was not an unqualified success.
"I played him at left-back and he is a right-sided player," said Redknapp. "He was completely on the wrong side. I knew that but didn't have any left-backs, so that was a problem. It left us with no balance."
And Redknapp also pointed out that football fans seem to be falling out of love with the FA Cup, just 8,984 fans having turned up at Loftus Road.
"You see teams going half-hearted at the FA Cup for some reason, teams that are in the middle of the table," he said.
"People want to see Premier League football I think and maybe the sales were more exciting for them than QPR and West Brom today. You'll find lots of clubs with attendances down."