You know, I've got a second account, might as well try it and see if it's true. But my 4-gates against Terran have failed pretty hard, 2 out of like the 3 times I've tried it.
I used to run a sase style 1-gate expand into 3-gate pressure in pvthttp://us.battle.net/sc2/en/forum/topic/5837014628
That gets a nexus and hits much later than a 4-gate with only 3 gateways worth of reinforcements. You can also wait for an additional warpin round and go with like 3 sentries, 5 zealot and 3 stalkers.
I used to win outright with that attack against 90% of platinum terrans and a lot of low diamonds. Still do it sometimes, but it gets a lot of early gas for the sentries and high diamond/masters players do things like use a barracks + supply depot in their wall at the natural completing a full wall which makes this attack a lot less effective.
If that killed a lot of people I imagine a 4-gate should have similar results.
PvP -- Chargelot/DT/Archon -- Been beating all sorts of openings, even Robo-based. Funny, what I have the most trouble with is when my opponent DT rushes me X-D
DT expand into chargelot archon can still be effective at all levels, but you will struggle a lot against people who wall-off their natural with gateways.
PvT -- Also Chargelot/DT/Archon, sometimes a 4-Immortal bust (Double Robo, Double Gateway), weirdly good at least at my level. 0_o
Immortal busts really struggle against lots of early marines which are a current favorite in the metagame right now. I still do them after fending off a 2-rax, but I don't like to do them blink because I kept walking across the map into a group of marines.
Chargelot/dt/archon can work, but it can also get shut down pretty hard. You have to delay them with dts enough to get up storm. Archons have a small range so marauders with conc shells just kite the zealots across the map then cleanup the archons. Scans really cause the dts damage to be limited.
PvZ -- 2-Base Chargelot/DT/Archon, sometimes with Immortals and Sentries if the game goes longer than I expected or if I decide to Forge-expand. Only thing my opponents can seem to do when I don't mess up is survive until Broodlords or kill me before I have my defenses up (I usually Gateway expand). Beats mass Roach quite nicely.
This struggles a lot against roach heavy builds. Like a lot. Creator Prime's opening does dts into dt/immortal/archon, but roach builds just steamroll pure charglot archon.