A final person said: "There's something wrong when the crowd at Spice Girls concert are all sitting down because no-one has a clue what song is on because the sound really is that bad".
However not everyone went home disappointed last night, with many calling the concert "amazing from start to finish", and a "magical night".
Melanie Brown (Scary Spice), Geri Horner (Ginger Spice), Melanie Chisholm (Sporty Spice) and Emma Bunton (Baby Spice) will play 13 dates over the next few weeks, starting with Dublin on Friday before performing in cities around Britain.
The Spice Girls have promised sound issues will be sorted for their next gig.
While many fans took to Twitter to share their excitement about attending the concert, others were quick to share their disappointment as sound problems inside the stadium meant they were unable to hear the show, and one fan even claimed they saw "huge numbers" walking out of the show, reportsdailymail.co.uk. "But am really surprised that nobody seems to be talking about how poor the sound was", the fan wrote.
Organisers declined to commet, but on Saturday morning, Melanie Brown shared a video message with fans on her Instagram story and addressed the issue, "We will see you in Cardiff".
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"Another tweeted: "@spicegirls now sitting in croke park, was absolutely buzzing to see you lot but its very disappointing cos the sound is really bad!
Although they have since made up, Geri was believed to be upset over the claim, with sources saying Mel B had "done damage" to their friendship.
I love you all so much, more than ever! Like a king or a queen, we celebrate you.
The Spice Girls last performed with all five original members at the closing ceremony of the London Olympics in 2012.
The source said that the remark created tension within the band, and even put the current tour in jeopardy, adding: "If they manage those United Kingdom dates then that will be the last you ever see of the Spice Girls".
Chisholm confirmed there was no bad blood between Beckham and the rest of the girls, as she replied, "Thanks honey!"