I found all of mine to be reliable too:
93 - tranny replaced at 200K miles. I did have to replace the IAC (or sump'n to fix wild idle variations once too). Timing belt replaced once.
03 - started overheating at 150K but that was just a temp sensor gremlin I never traced down. Just turned on the AC if it temp started going up & the aux fan kept it from overheating. The black paint was FUBAR but I rekin that's OBE now.
04 - never been in the shop. Paint on the spoiler is shot though.
The 3000GT was a real lemon but it was a severely abused NYC car before I got it so I don't blame Mitsu.