GGG, pure strenght character is awesome!! Lets talk how to do that for other two stats.

I think dex is fine as is. It grants evasion and if you get iron reflexes it grants armor (which no other stat does). The only problem I have is the lack of gem support for melee dex characters. If you play melee dex characters there are very few dex gems that increase your damage output and flicker strike seems to be the only option for groups if you go pure dex.