In general, support has not been great - particularly standard (non premium) support .
The main issue is that our IT staff has been using this platform for years and is very knowledgeable Whenever something goes wrong, we usually have a very precise idea of what the problem is. We are skilled at problem diagnosis. But the Oracle support process is very rigid and slow. Typically, we are required to go through a lengthy diagnosis process where they ask us multiple questions sometimes over several days and we are obliged to talk to different people with differing levels of knowledge.
Since we already know what the problem is, we really just want a patch or a bug fix, but it takes days to get there instead of minutes. This can be very frustrating. This is a big part of the reason why we pay for premium support. But it's still a bit disappointing.