Qinggong helps monks a lot. Other monk archetypes can also help a monk specialize, which is a big part of why the original monk was so weak, and Qinggong is compatible with any other archetype.
You are never going to have a tier 1 character as a monk, but there are several ways a well built archetyped monk can 'keep up'.
You can be okay. Qinggong is definitely a step up from an unarchetyped monk, but I still wouldn't put them as particularly strong. They get some neat abilities, but still lack accuracy and good bonus damage (the things they need the most for a typical damage dealing class).
A Qinggong monk with no other archetypes? Probably not especially well. But the thing about the Qinggong is that it stacks with literally all monk archetypes that don't give up your ki pool, so if there are another two or three of those that stack to make a sensible combination you put qinggong on top of that.
The way to make a core monk viable is either to use one of the really powerful archetypes (zen archer, sohei, tetori, etc.) and put Qinggong on top of that or to fit a lot of archetypes into one character (e.g. Sensei+Drunken Master+Monk of the Four Winds- since "spend 6 ki to give all your allies 3 extra standard actions" is a nice trick) and trade away basically anything you can with Qinggong.
Unchained Monks can select Qinggong Spell-like abilities as ki powers.
Depends on the party - power levels are per definition relative. You'll have a harder time competing with wildshape Druids, Summoner's Eidolons, or ragepouncing Barbarians then with sword-and-board Fighters or skillmonkey Rogues.
If you're looking for a competitive Monk, use either one of the archetypes that drastically alter the playstyle (like Tetori or Zen Archer), or play unchained Monk.
UnMonk with Ascetic Style+Ascetic Form and a two-handed weapon can actually go toe to toe with a Barbarian, or even surpass one if you add Variant Multiclass: Magus and Ki Arcana.
Even without Ascetic Style, UnMonk with Dragon Style, Jabbing Style, or VMC is pretty good.