I take it you are talking about Thorpe Park? I think you comment is unfounded , personally I've always found Thorpe Park to be one of the best managed & one of the best park for maintaining it's rides wthin the UK.
I love Thorpe Park, but honestly, their ride reliability is utterly dreadful. I can't remember the last time I visited the park and at least three major attractions weren't down for the majority of the day.
Slammer has been closed more often than it's been open this year.
Stealth has questionable reliability, but we'll let them off for that.
Colossus has broken down a lot this year, Detonator was down for several days, I visited a few weeks ago and Slammer, Rush, Stealth, Colossus, Tidal Wave and Detonator were down for either much of the day or all day. Tidal Wave opened several weeks after the park (having no lift chain is not a great excuse as far as I'm concerned) and I see Rumba Rapids has been closed for two days now.
I cannot remember the last time I visited and didn't encounter a breakdown. If there are less than three major shutdowns (i.e., an hour or more) that's a good day as far as I'm concerned.
As I say, love the park, but their maintenance is terrible.