I'd say ride reliability is a weird one, whilst on the face of it they look much worse than the others I'm not sure if they are...
If we start with the disaster of Saw, if you consider the fact the ride was having all sorts of issues before it even opened and was being tested, a process TP would have little input in, and then on its opening day the ride manufacture had to come out and install trim brakes not too sure you can blame them for that.
Swarm has suffered too, pictures on Facebook of bolts popping every other day, from the manufacture who are meant to be the best at what they do, again do you blame Tp for this or is there little they can do, bolts are checked but they can't keep an eye on then all day every day so when they pop it equals down time.
And then there's slammer and rush where I think the park deserve alot of credit, when they opened they were stupidly unreliable, but the park has worked on them and they run well ( when slammer does!!) and the amount of money actually spent on slammer where most parks could just as easily give up I think is very good of them