Fire Fang, Iron Head, Return, Stone Edge (only good attack here which doesn't get STAB on anyway), etc are all really low in base power (bar SE). :x Then there is Fire Blast and Hidden Power Ground, which both are paired up with Entei's below average 90 BP Special Attack.
Even if Entei and Raikou weren't in a fight, Entei still is mediocre at best, where as Raikou is like the Latios of OU (who was voted Uber twice), but in UU. Entei is SR weak, lacks resistances, outclassed by the likes of Blaziken, Magmortar, Moltres, Arcanine, etc.
It's sad that Entei can't make use of its stats, even with 115 Attack (which isn't spectacular), Entei's physical movepool is rather shallow that it gets stalled out by any physical wall. Then, Entei has to use its below average Special Attack to deal more damage as its special movepool is wider. Now, it's outclassed by a lot. D: Sure, it gets good stats, but when you look at its movepool and compare, even if it has good stats, without a good movepool makes it really poor.
Don't get me wrong, Entei pretty interesting to use for NU.
