Cowan and Company's Doug Creutz has called May's US sales "disappointing", noting that outside of Take-Two's success with Red Dead Redemption, publisher's have suffered with game sales compared to last year.
Software sales were up overall by 4 per cent, with Red Dead Redemption boosting Take-Two's year-on-year sales 464 per cent, as the publisher claimed 23 per cent of total software sales.
However, of the other publishers that Cowan and Company covers, THQ took the biggest knock as sales slumped 53 per cent year-on-year, while Activision's sales were down 40 per cent and EA's down 20 per cent.
Read Dead Redemption took the number one and two spots, with other new releases in the top ten including Super Mario Galaxy 2 (at three) from Nintendo, THQ's UFC 2010 (four and five), Microsoft's Alan Wake (eight), Pokemon SoulSilver (nine) and EA's Skate 3 (ten).
High profile releases in the US during May that didn't make the top ten best-sellers include Activision's Blur and Shrek Forever After, Disney's Split/Second, Prince of Persia: The Forgotten Sands from Ubisoft, Sony's ModNation Racers and Lost Planet 2 from Capcom.