>>713340156There are more good legendaries than there are bad ones. Having a larger base stat total counts for a lot. Some non-boxart legendaries arent the best, but a lot of them are even better than actual boxart pokemon and have become meta staples
gen 1 was zapdos, mew, mewtwo
gen 2 was suicune and celebi
gen 3 was Latios/latias, deoxys
gen 4 had heatran, darkrai, manaphy, shaymin
gen 5 had the faggot genie trio that made people quit the game, terrakion, arceus, genesect
and there were a bunch that were still great, but not meta-staples.
The only ones i can think of (from pre-genVI) that were actually bad were the Regi's, and Moltres/articuno who got unlocky and were made very weak to stealth rocks