Just thought I'd share my experience, as I'm now a rail commuter. A couple of weeks ago, my office was moved from Orpington to central London, right in the city. Meaning I've had to switch a ~40 minute drive to a ~15 minute ride to the station and then 45-50 minute train ride.
For the train I get in the morning (to Cannon Street), I'm boarding at the last station before it becomes fast to London Bridge. It's busy enough that I can't get a seat, but as it's fast and doesn't keep stopping, I can plonk myself down on the floor near the doors and read a book until London Bridge. It's a 48 minute trip according to the timetable. The home commute is better - it's the reverse journey, but as I'm boarding an empty train at the start, I'm pretty much guaranteed a seat.
First couple of weeks this was fine - I miss the comfort and reliability of driving, but it's not as bad as I thought. Then on Sunday, they made a big update to the timetables which they claimed would lead to more efficient running, more trains, etc etc. But ever since they introduced these on Sunday, things has gotten markedly worse. I'm sure some of you will have seen the news about how Thameslink basically fell over on the first day of the new timetables because they hadn't scheduled enough drivers. There were no changes scheduled to my trains (except apparently cutting 7 minutes off my journey home).
Monday morning, the train I boarded was a little busier, due to cancelled services - no biggy, still found a spot on the floor. In the evening, absolute chaos. "Track connection failure" at Hither Green (which I hear was due to a lightning strike) basically brought London Bridge to a standstill. I swapped trains to a slow Thameslink service which then left the station late because they were due to switch drivers and the replacement was late, apparently. I ended up getting home two hours late. Fair enough, cant account for emergencies like that.
Tuesday morning - morning train arrives with 8 coaches instead of 12. Packed in like sardines, so instead of being able to sit on the floor, I have to hang off a rail for the entire ride - which, for some reason, slowed to a jogging pace for the last half of the journey. Tuesday evening - I was looking forward to getting home 7 minutes earlier due to the proposed new timetable. Result? We got in 10 minutes later than the original time because we were stuck behind another train for the whole journey. This morning, train was busier than usual, although I managed to find a spot on the floor.
So to sum up, commuting by train wasn't too bad, until they changed the timetables to introduce new services and make things better. I'm really hoping this is just teething trouble with the new changes, but given the amount of time they've been planning all this and the amount of effort they've put into advertising it, you would have thought that they might have sorted the basics such as making sure they had enough staff for the new trains. It's things like this which make commuting by train frustrating, especially when you're paying through the nose for it. For me, it's been an annoyance, but for others, who have had services cancelled outright, it can cause chaos.