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Well, if we're talking about archers, the most beloved and respected one is the Air Elemental. First, it's the strongest Tier 2 unit, with 25 hit points. At Tier 2, it's a real powerhouse, and even in the early game, they provide significant help.
I won't even mention Liches; I've kind of lost interest in playing as Necropolis.
Elves aren't bad, but in online games, they're usually the first to be killed, so they're not very effective.
The archers in the castle are very weak. 60 Monks deal more damage than 200 archers (even though the latter shoot twice).
Orcs are okay, but not particularly strong; they're average archers.
Goblins are helpful for the first 3 weeks, but then they just become cannon fodder.
Cyclops are amazing, but they're very difficult to build (20 crystals; it's better to spend them on upgrading Bears rather than Cyclops).
I'll just say one thing about Titans, and I won't be the first to say it: "Titans rule!" :D
Lizards aren't really archers; they're more like some kind of beast.
Gog are also helpful in the first 3 weeks, just like Goblins.
That's pretty much my opinion. Archers are good, but if you have an Air Expert, it's better to focus on stronger units.