The best GP's in my opinion are:
Greek:
-Lightning Bolt (bye bye nidhogg/osiris)
-Lightning Storm (bye bye my 30 archers)
-Earthquake (c the buildings later)
-early rush with Pestilince
dislike:
-I think sentinels suck and die really fast, don't be scared of em
-if u need plenty for resources then shame on u cuz ur economy should be big enough were it wouldn't matter imo
Egyptian:
-vision backed up by meteor, so u don't even have to be there
-osiris can cause havoc
dislike:
-tornado, can be useless or dangerous
-shifting sands, needs to "shift" more ppl
Norse:
-frost army and siege town
-nidhogg can distract armies in trying to only kill it
-flaming weapons, this levels armies so fast
-fimbulwinter on an ungaurded town will destroy it
dislike:
-undermine, not many ppl build walls
-ragnarok, not many ppl use this and i think it is a last ditch effort to save yourself.