The effect on Intel is far more severe than on other architectures. There were three vulnerabilities, two grouped together as "spectre" and one called "meltdown." Intel products are uniquely vulnerable to the meltdown attack, while many CPUs are vulnerable to spectre. The summary AFAIUI is that for most CPUs you can attack userspace processes with these techniques (think Javascript running in a browser), while for Intel CPUs you can also attack the kernel. Intel CPUs also seem to be somewhat easier to attack than others because of a higher-bandwidth side channel.