I actually though this show was going to be pretty crappy and did not even pick it up till after episode 4 was out. After listening to a podcast where one of the anibloggers was talking about how awesome the show was I figured I would give it a try.
Basically the show is Saki with Tanks. It really does not try to explain it too much and thats good. No episode is boring and it has tons of history and tank refrences to create a new feel of fanservice. None of the characters seem over done, so there is not anyreason to be disappointed in any of them, (none of them annoy me yet). There are lots of tank battles to keep the flow of the show going at a great pace.
Basically if you have an interest in tanks and are a fan of moe this show balances them very well and is strangly good and addicting.