I got it the 23rd, yayness. The game is AWESOME. Just wait till you've had your first Big Daddy experience XD.
Though I have to say, I thought there were supposed to be alot more Plasmids. Now I keep ending up using the same Plasmids over and over again.
*SPOILER*
I tend to use Electro Bolt on anything mechanical, and hack it, and ONLY for that, since Static Discharge does the same, without using EVE, for biological enemies. Now, I could have one of the Engineering Tonics to make the hacks less difficult, but you'll only lose a little bit of health when you bring the fluid to a dead end (as opposed to losing ALOT of health when leading it to an OVERLOAD tile), and you can just try again. So I generally use the Hackers Delight Tonic (get Health and EVE whenever you hack).
I NEVER use the Winter Touch (or something like that), since it freezes your opponents, and they will shatter in a thousand pieces, therefore rendering you unable to search the bodies for loot.
I hardly use Enrage, since it would only be helpful when there's a BD with some Splicers, but the problem is , the BD kills them in 1 swipe.
The Cyclone Trap, I didn't even bother getting that. Who says the Splicers will walk over it?
Insect Swarm. Now this is one I'm pretty disappointed with. Remember one of the first Bioshock trailers? In which he injects himself, and creates a swarm of angry wasps? It's nothing like that.
Im generally disappointed with the introduction of the Plasmids anyways, when you got the Electro Bolt, there was this awesome cutscene. I just wish they did that with every Plasmid. Also, IF there IS a Teleport Plasmid, they've put it way to far into the game. I haven't seen it yet 
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One last thing, some of the Tonics require you using the Wrench. Seriously, is anyone gonna use the wrench when you have a effing Grenade Launcher in your inventory?!
Other than that, the game is AWESOME. The atmosphere (heh, pun not intended) is very creepy, and the graphics are AWESOME (sometimes you come across a pool of oil/fuel/whatever, and it burns at a slightly different colour than, say, a Splicer). Also, the water effects are purdy, and I love the fact that the screen goes watery whenever you pass through a waterfall. Only minor error is the fact that water doesn't distort when you look through it. What I mean is, when you look "outside", to the rest of Rapture. You should have a perfect view, without any rippling and the like.