In the UK, yes, they operate a couple of rail franchises.
Personally I've always found them far and away the best company - but they have the misfortune of running "cross country" routes, which go through every bottleneck in our rail system :D
Toilets frequently out of order. Carriages with toilets reeking of urine. Reservations downloaded to the train maybe one time in 5. Empty first class carriages while standard contains double the number of people. Attempting to stop people with open walk-on tickets from getting on valid trains. etc. etc.
Maybe it's just my (and everyone I know's) bad luck that these things happen every single time I (we) use them.