Speaking of turn rates, I'm getting annoyed with all the people saying:
Cruisers should have higher turn rates!
And such. Granted we did see the Enterprise D do some sharp turns, but if everything we saw on-screen was in-game, almost everyone would choose cruiser. I often change targets in my heavy cruiser, so I can deal as much DPS as I can; my Galaxy class will probably have 2 fore beams, 2 aft beams, 2 fore photons and 1 aft photon (Since I get better hits with photons rather than quantums due to my skills, they're higher DPS anyway)
The global cooldown on torpedos makes using 2 types, other than 1 type fore, 1 type aft, useless. But interesting, with 2 photon launchers you can fire a torp every 3 seconds, rather than 1 every 6.
To make it simpler I've stolen some info (Which I've put into a table and attached)