I've played it for a few hours now, so I'm not deeply familiar with it.  But I've played just about all the game modes on all the maps, and I'm starting to get a feel for the game.  So far, I'm not greatly impressed.  There's some potential here, I like what they're doing with gun combat, and all the basic concepts seem solid initially.  But the demo is hampered down by some technical problems, and a few gameplay issues.
 
Things they can fix in the beta to improve the overall game:
 
Get rid of the heavy mouse acceleration.  I'm not really sure what you're trying to do by making my aim extremely finnicky.  I put the sensitivity down to the second lowest setting, and it still seems it's not low enough.  And then at random times by view will just swing wildly around when I'm just gently moving the mouse.  Maybe a bug related to the mouse acceleration?  Either way, it's unnecessary, at least give us a toggle option.
 
Add more maps.  I don't know if there's so few because this is a beta, or because they're a small team without enough resources, but either way, it currently is a problem.  6 maps doesn't really add enough variety, and I could really do with some more.  Hopefully the final version will come with more.
 
Add more class or weapon variety.  4 classes seems thin initially, but if it's balanced it can work.  And so far, the balance is relatively solid.  I would still like to see more variety.  Maybe they should give some thought towards adding a second primary weapon to each class you can choose.  As it is right now, I'm already getting a little bit tired of the same 4 weapons over and over again.  
 
Give me some graphics options! I can change my resolution.... great.  Maybe I'm just missing it?  But I'd like to be able to turn off depth of field or maybe some other superfluous options.  My system isn't all that great and I frequently get sub-30 FPS in game.  I don't like the fact that we're given literally no options other than resolution to deal with this.
 
Overall, I've gotten some enjoyment out of it. But I don't really see myself sticking with it if it remains the way it is for long.  Not enough variety, and some technical problems crop up from time to time.  Thankfully, this is what betas are for.   Hopefully they'll take any feedback to heart and improve on the game.  These are the four biggest issues I can think of right now, if they can fix them, this could turn into a very solid game.
 
So, what are your opinions on the game so far?  I'm interested to know if I'm the only one who takes issues to these things.

Lead & Gold costs under £10 and features six maps? Well TF2's beta launched with six maps and cost over double what Lead & Gold is currently selling for, and it took Valve (a large company) quite a bit of time to get more maps released. So I'd say give Lead & Gold a bit of slack for now, it is a small and new game in beta stage. I'm sure they have plans for more maps eventually. 
 
But at least you pre-ordered, sometimes the little guys need the helping hand of pre-order money to help get more maps released! :)

downloading it as we speak.. hope i have a better time with it :(

The studios' community manager is an unknowing asshole and the game needs an announcer and windowed mode.

" But at least you pre-ordered, sometimes the little guys need the helping hand of pre-order money to help get more maps released! :) "

only thing i can complain about atm are the bad pings/delay when playing online... they said they're working on dedicated servers though, i hope they'll release them relatively soon after release

Is this anything like Team Fortress? From the looks of it it seems that it's just third person TF 150 years ago.

so should i buy it. Cause i love tf2.

" so should i buy it. Cause i love tf2. "

Best spent $14 in a very long time for me. 
The game feels and looks more like a $30 game.