It's good enough for recent releases (note you may have to open a port for passive XDCC) but because it's not easy to automate, even public trackers + *arrs (w/ VPN) are just more convenient.
Occasionally you might find releases on IRC and not on public trackers, and visa versa, so it's good to have a backup. I prefer scene releases so it's easy to find specific stuff with the xdcc search sites (e.g. dot eu and sun), and maybe a 'lil help from srrdb to verify CRCs.