Broken, maybe not. But hey, it's still fucking Latios. You know, that thing with 130 base special attack with what might be the best possible STAB in the game? And can outspeed a fair chunk of the metagame?
That thing that can liquify anything that isn't SpDef T-Tar, Steel-typed or a member of the Blissey family? Yeah that guy, he's still OU for some reason that is completely beyond my comprehension. It doesn't even have the decency to get shit on by entry hazards like Volcarona, so checking it that way is out. And now that ScarfChomp has gone back to jail, there's one less thing running around standard that can scare it away.
Which, to be quite honest, is really the only reason people continue to complain about him (that, and its checks were freely set up on by Blaziken, who was still roaming OU in the Round that Latios got the simple majority vote).
There are quite a few things that are steel-typed for anti-Latios cries to pretend they are a single category. Heatran, Metagross, Jirachi, Ferrothorn, and Scizor are just 5 of the viable OU steels, and they can all deal with Latios while playing differently enough to merit individual consideration. It is depressingly weak to priority (doesn't even have Flame Body as a consolation prize), and does not resist Stealth Rock or any form of status.
While it isn't frail, it certainly isn't bulky and will take a decent chunk from any attack it switches into. SpecsLatios becomes extreme setup bait once it attacks (and there are plenty of things that can sponge that Draco Meteor), while LO CM Latios is even more susceptible to 4MSS and passive damage.
Even LO CMLatios in the rain, which I find to be Latios' most effective set, has issues getting past its main counters (Tar brings the sand with it, Ferrothorn no longer has to worry about HP Fire, SpD Metagross can take a hit and strike back, Jirachi can potentially take 2 hits and paralyze, etc). The main use of the rain is to hit Scizor for the OHKO (which, even then, isn't guaranteed without rocks).
Latios on its own is nothing special. Latios with support is just that - a sweeper with support. Hell, I've been running CB Staraptor lately and have been more impressed, since it can actually fire off consecutive, boosted hits without becoming complete set up fodder.
Notice how I did not mention Surf or HP Fire when talking about Latios, which anti-Latios users will be quick to cite as the reason for SpecsLatios being broken. I'll say it now before someone tries that argument - if you are predicting, you aren't really muscling past anything, you are predicting. The side countering Latios can thus do the same.
Honestly, I can only think of Starmie. Others lack speed/coverage.
Scarf Mienshao can outrun Volcarona (which is really the only +1 sweeper you need to be concerned about other than Mence) and has Stone Edge for them. Meanwhile, U-Turn and HJK let it scout/recover health and dish out damage at the same time, respectively. Those defenses don't matter as much when you are revenge killing.
Scarf Terrakion is beastly. Close Combat / Stone Edge / X-Scissor / Filler works wonders, with anything from EQ to Quick Attack taking up the last slot. It is fairly bulky (particularly in Sand), outruns a large portion of the metagame even without the scarf, is nearly as strong as Garchomp statistically and has a 120 BP attack it can fire off at will without being locked in (it may not affect ghosts, but you didn't see Chomp Outrage-sweeping until steels were removed). It's looking like one of the more viable physical scarfers, IMO, especially for DDNite (whose Extremespeed it resists).
Scarf Landorus, as mentioned, isn't as great as Garchomp, but it is still good. 130 BP attacks in sand (and a solid 100 otherwise) along with U-Turn and a filler move usually cover the revenge-killing needs. It has the Thunder Wave immunity that Garchomp had (along with Spikes and TSpikes), which helps against Thundurus, too. Base 101 speed still trolls Mence/Volcarona, which is what counts as far as Scarf goes.
Scarf Infernape has its uses as well with a great Fire STAB to back up its fighting moves. U-Turn, Close Combat, Flare Blitz, Stone Edge cover what you need it to, and base 108 speed is still great. While frail, it does at least resist Bullet Punch and Sucker Punch. Infernape also gains a benefit from being used under Drought conditions, and is capable of outrunning even Venusaur. It does tend to hit a bit weaker than the other three I listed, but high base power moves and the general frailty of boosting sweepers helps remedy that issue.
Special scarfers I find to be a bit less effective, but they do exist. Starmie is great (water moves discourage Tar from switching in in particular, which is nice), Infernape can run a special scarf set, Gengar and Azelf are decent. The problem is that special scarfers are frail to begin with and often weak to Pursuit. Raikou is another option - even with a Rash nature, it will outspeed Mence and Volcarona by 1 point, allowing it to run Aura Sphere / Weather Ball / Thunderbolt / HP Ice and still fulfill its scarfer duties.
Obviously those are all assuming that you need a scarfer to revenge +1 threats. If you just want something to outspeed unboosted pokemon, the options are pretty open.