I dont really like the ziggurat much since it doesn't really do anything special but appear early and i don't even think it's on sumerians tech list.. he doesn't start with myst so you have to divert down that path code of laws is also right after priesthood..
it's also pretty easy to beeline or do a slingshot to code of laws so you can get it really quick if you wanted it.
i think rathaus or whatever is the best building but i prefer the iklhanda or whatnot instead personally because it comes so early and goes well with zulu and his utterly crazy overpowering synergy lol
that is suppose to be kept hush so the don't nerf him anymore then they did with the dumb worker changes
alters are great tho too but no one mentions um cuz ppl don't really like the aztec uu so they get less playtime i think.
hippoderm is great, ball court is nice.
i think every building is amazing you just have to either know how to use it or it has to fit your play style, everyone plays differently so a different building is going to suit a different players needs more.
for instance, if your going for a cultural win the most powerful buildings in the game are prob a odeon and a pavillion but if your going for a space ship victory they are usless.
alot of people like to warmonger so that's prob why the rathaus and iklhanda get good marks.
i'd like to reiterate this last small detail..... dikes suck, thanks