i'm with DDRmaster, things will always sift into tiers. In this case, we have the "if i'm not the fastest, i'm dead" tier with things like Scarf Landorus, which you can thank for the Scarf +Spe kions; then there's the "lemme outspeed slowmons" tier which is stuff like Rachi, Rotom-W, etc. then there's the tier that congregates around Tyranitar like it always has. Then we have the "fuck it i lost the speed tie" tier with things like Ferro who just dgaf.
But yeah, in general, those are the four tiers in this meta, some fast, some slow. Gen V is hardly ludicrous speed, however, unless you're in Tier I.