You may be right. Like I said, it has been a while since I last used Opera (several years) and then there were many instances where I had to switch to other browsers to be able to proceed. Most annoyingly, my online banking would work in Firefox (and I'm sure in IE), but not in Opera. These things made it very annoying for daily use.

Maybe it is not fair to blame Opera for quirks and deviations from standards any more than others. The difference is that Opera has such a small market share that developers don't account for Opera's quirks as much as they do for IE, Firefox and Webkit.