Re: Weber's Honor series.

Yes the physics is a bit ... off, at times.
Yes some of the later books get too far into politics and info dumps and the like.
I still like them.

The grav drive system used has already been covered further up this thread. Missiles basically come in 3 warhead flavours - no warhead when you can generate an actual hit (apart from hitting a planet or as a stealth attack on a sleeping foe, not much use), nuke (out of date, getting a missile close enough to a combat ship for a nuke to be useful is extremely rare, mostly used in for cleaning up after a battle) and the x-ray laser (the missile only has to get to within 20000 km of so of the target).
Even with munitions that pull 90000 g acceleration, 6 light minute engagements give plenty of preparation time ...