You shouln't judge the game by what the AI does, really. It's how human players use the ships and researches that defines how well the game is programmed. The AI not building lots of fleet may be related to the AI being programmed to prioritize capships more (which is a good thing compared to Diplomacy), but in a wrong way that messed up the way it builds frigates (which makes it bad again).
Or maybe the AI "forgot" how to research past fleet logistics 4 or 5, that's about the amout of fleet they push out after all, a titan, 14 caps and some minor frigate backup.
As for novaliths, it's annoying how AIs gang up on one player (preferrably ME) with their novaliths even if they are set to be in different teams. Either that or they blast a piratebase to hell and deprive me of my favorite XP income.