I absolutely love it - and I teach English, so all my learners have already failed, most hate my subject, many don't want to it. It's compulsory too.
My specialist interest is behaviour management, which fits because, honestly, the behaviour can be appalling.
I've been called all manner of names, had to break up numerous fights (including chairs being thrown at people), parental support is often totally missing...
There isn't any money, pay is lower than schools (even though I have a good degree and a PGCE), students are disengaged. Many are living in poverty.
But all of that aside, when you get the kids onside, when you see them grow and change, when they pass exams, or improve, or just say "hello" when you pass them in the corridor after months of surliness it is the BEST job in the world.
You need to be incredibly resilient, able to stand your ground in the face of some extreme behaviour, be able to admit when you are wrong, be able to laugh at yourself, be able to see through the walls they have built around themselves, be able to deal with a HUGE amount of stress and pressure and not break your heart over the kid whose clothes smell of cat pee, the kid whose skin is grey with dirt or the girl who is parenting her five younger siblings because their mum is on drugs.
It really isn't for everyone. It takes a certain type of person to teach longterm in this type of establishment. The behaviour gets worse year on year and bums on seats for funding takes precedence over anything but the most extreme behaviour.
I love it! But many, many people don't. We have high staff turnover, and lots of people off with stress.
I would recommend that you ask to shadow a teacher in FE before you make a decision.