I don't really have many issues with bug management on GNOME (that pain really goes to the bigger multi-module maintainers and the reassigning of bugs to the right places in the stacks), but for code review I'd probably just replace Splinter with a standalone instance of Review Board and call it good enough for the time being - basically waiting for someone to come up with an integrated code review/issue tracker that isn't tied to their company's infrastructure (Hello Google), is standalone installable and manageable (sorry GitHub) and doesn't impose a pull model on patch pushers (goodbye GitLab).

if i had to pick something, i would at the least give phabricator a serious look to see how it stacked up against gitlab [https://www.phacility.com/phabricator/]