I'm in - can I have member number 12154? :)
Did the DBA thing 6/7/8 years ago with versions 7 and 8i. Did some fairly extensive Y2K upgrades. One night, about 2AM, I remember deleting a data file before dropping a tablespace, and there was no way on earth Oracle would let me recover from it without doing a full restore. Walked away from the whole product shortly after, and started evangelizing SQL Server, which is a much much better RDBMS. I didn't mind the technical challenge of Oracle, but when it was in areas that didn't need to be challenging, it just got silly. Keep the simple stuff simple is what I say.
Pet hates? The installer (at least it's improved from the old Oracle 7/Developer 2000 days, but that's not saying much), TNSNAMES (management flat out refused to even consider putting them in a directory service or on a network share, so I ended up having to cook up a logon script to copy new TNSNAMES.ORA files to client PCs), the way you can never really be sure what ORACLE_HOME 3rd party software is using (I spend a lot of time troubleshooting those problems for our developers), Forms and Discoverer, ADI (it never worked and was incompatible with their other products when installed on the same machine), JInitiator (or anything Java based, for that matter), the old proprietary IP stack, having to interoperate with GW-BASIC (now there's a WTF all on it's own) for some ghastly mess one of our senior developers brewed up once, the extraordinarily high levels of maintenance required, and the whole general arrogance that surrounds the product.
Does it still not support identity columns? Add that to the list, if so.