I usually get stats on hammerstorm before his other skills unless the line up is really gank heavy, in which case I will get more into galvanize for the speed boost
Hammerstorm: skip W in most cases. Always at least 1 level in galvanize for the bonus movespeed, but I've seen people pass up the other 3 levels for stats.
Swiftblade: Spin and stats until level 6 so you can ult and spin on one mana pool.
Magmus: Very rarely, stun and stats after 1 level in steam bath. It's a dumb build, but I've seen it. More commonly, stats over volcanic touch after maxing out the other two, but still, volcanic touch has its uses.
Soul Reaper: Stats over inhuman nature. I've seen this, but do not recommend it.
Those are the only heroes I can think of off the top of my head. I would only recommend it for hammer and swift. Why would you skip any skills on warbeast? Battle cry gives your whole team +44 damage. That's a free slayer.
I do on Engineer for trolling (stats mines ulti).
I think its bad in most cases even for the ones that are commonly accepted (bar Hammerstorm). I think its fine if your team can't take advantage of the +mana regen early, to skip Chilling Presence altogether on Glacuis. By the time you level it up, everyone will have their mana needs more or less satisfied and dumping points into that skill will be wasted. Gladiator can do it if you can't time Showdown, you lose out on the cast range increase by not leveling it.
bloodhunter: after getting 1lvl in blood crazy, if you only use it to silence/dot
gemeni: used to be good with ulti form
witch slayer: dont lvl mana drain in some ocasions
swift, witch, and maybe fayde. used to on FA and might be able to still with the split shot.
(i am white, i am a ****ing bum. i do live at home with my mom. my boy future is an uncle tom. and i have shitty stats, beat ya to it)
Ss when I go mid I get souls and stats for a few but either way I'll get stats before dread
Pred and sb are the best ive seen with stats
For lulz play martyr stats and his q ability and play mid... you would most likely wreck shyt if your below 1600 lolz
first couple levels on skillblade, stats over skill. you'll have enough mana for spin and r
Swiftblade and magmus is important for couple levels of stats so you can combo.
Some of the ones I've seen on this list are dumb like Andro... But the only one I haven't seen mentioned yet that can be viable is Moon Queen. And as it has been pointed out OP, WB's warcry is probably his best skill overall, and should be leveled before his passive. And of course, if you're really pro, skip Engineer's mines ;D
Carry Engineer: I get; 1 stats 1 stats 1 4 1 then i max stats and ulti and turret and get mines last.
Hmph, I'm up against all of you guys? Hahah, well then, sounds like I have nothing to worry about. This war's already been won.
sometimes i lvl stats before manareg on glacius
Just lvl his 2 passive and stats. And play it with right click. You can also lvl his ulti just to ks your team.