I wouldn't even say "alright" to be honest. They haven't even scored a number 1 and one of their tracks was sitting outside the top 70 just three weeks after it's release.
They are simply a rip-of Girls Aloud personally.
11/13 top ten singles is pretty good. They've had consistant success since 2008 which is pretty good considering how quickly artists fade in popularity (Tinchy Stryder, Dizzee Rascal, September, Duffy, Ting Tings, Leona Lewis, Alexandra Burke, Nelly Furtardo etc). Not many artists can still secure top ten singles five years into their career, never mind a girl band with no real support behind them (little airplay, no X-Factor or Britains Got Talent, no media scandals).