Gamer's opinions, yus.
1st one!
You need details. Lots more details, at least, on it. A, for art purposes in the future, and more importantly, B being that it needs... Whut... a minute and forty seconds worth of constant firing until it is out, more details on how exactly difficult it is to reload. I'd be picky too and detail how the 'bullets' move and what it does and stuff, but that isn't necessary.
2nd one!
Bleh. Anti-matter is horribly in efficient, we've had discussions on this topic. Although you might not have been in them. Anyway, tis 1 to 1. And hard to contain, apparently. So most of the mass of these things goes to containing it, and not to actual anti matter which is no less 1 to 1. Also. Why does this have more ammo than the main weapon? Also. If it is a space only weapon... How... does it have a short range?
3rd one!
Plasma missiles are fine. See above for compressed antimatter which... I was told once antimatter CAN'T be compressed, but there is the full possibility this was wrong, but still ineffective. Subspace detonator REALLY, REALLY needs details on how it works, or a link to another article that tells how it works.
4rth one!
Again, details. Also... Why is this powered via suit and the, again, main weapon not? Also. It isn't that powerful persay, more so it is a stinger like weapon that fires a lot to do more.
5th one!
... I really dislike this one for some reason. It DOES go into detail, but it just... Doesn't seem to make much sense on how exactly it works. By that, I mean it doesn't seem possible. I could be wrong easily.
There ya go.