There is nothing wrong with go ADAT, however there are some limitations.
1. in order to add more tracks, you need to add more machines.
2. If a machine breaks or need maintanence, they aren't worth fixing due to the value of the machine vs. cost to fix it
3. Even though the converters were pretty good at the time, even the cheapest 24 bit soundcard you could buy today is much better sounding
4. No editing, no undo
5. Tapes are a PIA, now they are hard to get hold of. You spend half of your life formatting, rewinding and fast farwarding
You run into these same problems with any tape based system. Even the Tascam DA-series machines which were much more reliable and less break-downy suffer from these same problems.
If you are looking for a machine, a hard disc recorder would be a much better deal.