ok let me be honest....
remember when ovi maps first came about? it was terrible! but rapidly over time it became fabulous..
agreed not as comprehensive as google maps but it still has its pluses over google maps....
(try this link from your n900 see if this helps you http://n900maps.ath.cx )
maemo is a totally new OS and it has been stated that the N900 is not the "mass consumer device" so expect these sort of things....
again i said alot of people bought the n900 and didnt know what they were getting into...they just bought it as it was the "new thing"...
ovi store- unless you havent seen " coming soon"...and if you want apps why not try maemo.select? maybe even downloads on this site? or the repositories?
again i say why are you disappointed in a device that was and has been clearly stated as "not a main stream device"?