That might be true of their PC software but their large systems operating systems hardware is in a word bulletproof. So I would not make a blanket statement like that.
I work on large IBM systems and the ORACLE folks are just pea green with envy over the reliability of the Power systems and the I operating system with DB2.
Technology is like a salad bar you use whats' good and whats' good for you and leave the rest.
Regards...
Having worked with big iron for several decades, I am not impressed. Microprocessor based systems have been just as reliable and effective, and, yes, I have personally built as large, scalable, and high performance database systems as anything I have worked on for a mainframe. I am not impressed with IBM in any way. It is jsut another large corporation where the execs don’t even know what they sell.