Well Playing as Ra(Or Set or Isis) is ALOT different then Greek/Norse/Atlantean...Barracks units will not run an opponent over and win the game for ya unless in mass...But Migdol units will not do that for you either let me give you an example
Greeks-Actually have real "Mainline" Units...Hoplites, Toxtoes,and Hippikons are real "Generic" units meaning they do "Well" against everything except their "Direct Hard Counters" a Hard Counter is a unit that does a "Bonus" Damage against a particualr type of unit...Greeks have 3 "Mainline Units" that are powerful and will kill anything but their direct counters.
Norse-The Norse have "Above Average" Infantry, Exceptional Cavarly, and no archers to speak of unless you classify Throwing Axemen..The Ulfsark is more of a "Mainline" unit then the Egypt Spearmen...is stronger..and gets tons of upgrades through the Forseti+Bragi+Tyr godpath...the Huskarl is also "Close" to a mainline unit since it kills cav and only dies vs counter-infantry and other infantry...
The Atlanteans have "superior" Counter Units in the Classical age...and Mainline units that are not quite as strong as Greek Mainline units...but are close...very close...
Now when looking at Egypt they have no real "Mainline" unit...the Spearman is the "closest" thing to a "Mainline" unit...but it only has 101 hp fully upgraded "Without" the Horus techs...a Base Hoplite has 115 hp with no upgrades...compared to a bas Hoplite...the Spearmen doesn't look that good does it? The Axemen only kills infantry and stinks vs anything else, and the Slinger only kills other archers, and stinks vs anything else unless in mass due to low attack...Now when you look at Migdol units...the Camel has 137 hp base(The Ra camel has 165)...But it cost 3 pop and only fares well against archers,cav,and siege...the Chariot Archer is just the games best Raiding unit...but again isn't a hardline fighter..the War Elephant is a good "meatshield" but is too slow to be effective unless you have a forward Migdol on your opponent.
As you can see..."What units" you choose to make with Egypt is "more important" then the units you choose with other civs...simply because Eggy units lack the "shear power" that Greek/Norse/Atlantean "Mainline" Generic units have....that's where Myth units/Mercs come into play...to "Even up" this inherit disadvantage
I usually do a mix...IE Camel+Axemen against Atlantean until they get Mythic age(If they do that is) and start making Fanatics...Atlanteans cannot counter a Ra player or eggy player that Goes Camel+Axemen until they get Fanatics in mythic...The Camels kill the Contarious,Arcus,Turma,and Cherio...and the Axemen kills the Murmillo and Katapeltes...i won a game Today and the kid told me Eggy was OP cuz i used a Camel Axe Combo on him and owned him in Herioc age.
Against Norse...Again...Camel+Axemen combo...very hard for a Norse player to stop as the Axemen mop up any infantry that can counter your Camels...and the Camels keep his Jarls from being very effective...of course always have Preist support for his myth units and a few Myth units of your own
Against Greek it gets Tougher...actually Greeks are Egypts toughest opponents...simply becuase of the sheer power of theur units...you 2 choices in this scenario...1.Do as Josey does...go Classical...pump mad Spears and bring it to the Greek player...you have to outnumber him with spears...which should be hard due to the training time of Hips.vs.Spears...your Spears can win early on..due to outnumbering him...but the longer you let the Greek player go...the less effective your Spears become against Hipps IE FU Hipps Run over Spears.Choice 2 is..you can FH and go for more of a Migdol unit spm and raid him with Chariot Archers and Using Camels to quell his Cav raids while trying to secure a Forward Tc on him to Siege Cheese/Merc him to death with a few Spears/Axe/Slings mixed in...as i said..i ahve more trouble with Greek players as Eggypt then any other Gods out their...Greeks are just so adaptable and have tough units.
But never go 100% Barracks...but never go 100% Migdol either...try to mix the 2..IE Camel+Axe,Spear+Chariot, bout the only Migdol combo i will use is Elephant+Chariot in some situations