Let me put it this way, I would feel better if reputable airlines did their heavy maintenance in their own facilities on their home turf - less chance of things lost in translation or across a cultural divide. Since things can no longer be this way, which one has to acknowledge, I fell better if said reputable airline sets up and runs its own overseas maintenance centers.
The first thing Thai did after winning the maintenance contract for ANA's 747 fleet was to torch one of those. Also, there are quite a few hints on the net about creative maintenance that was discovered on ex-Thai 747s on entering the second hand market.