I personally don't like it. All the buildings look the same, all the map areas look the same, and it's just a continual fight with no end in sight. Going from one fight to another doesn't add much because the thing you're trying to take over looks exactly the same as the last place you just took over.
It's really neat for a little while. But it doesn't have staying power.
It's a lot of fun with friends or a community. But if you plan on trying to play alone, don't.
It's received a ton of major updates since release though that have nearly completely changed the way the game flows. Originally the above poster was correct that every base was pretty much cookie cutter. However many have been completely remade now.