Originally Posted by
huth
It's a 3 iLvl gain compared to a relic with no throughput-trait(e.g. one with Moonkin Armor or the auto-heal), not to any relic.
Since the trait directly gives you crit, no minimum crit is necessary.
It's definitely the strongest one for single target, but losing 3 iLvl when replacing pretty much any other single target throughput trait is at best no change, and most of the time a loss.
Also, don't look at individual Starsurges. Your mind will overemphasize non-crits, making you feel like you crit far less than you actually do. Look at statistics for large samples and see if they match up with your crit chance.