Okay i just finished watching it, and your a decent spy. I'll address somethings that i saw happen most often which were....
1) cloaking, you seemed to know when TO cloak, but you cloaked in some unnecessary places, and wasted it a bit. Try to use it less, and remember, just because there around, doesn't necessarily mean they can see you.
2) disguises. Overall you do a good job of knowing whom to disguise as, however you leaned twords sniper, something you musn't do, simply because then they know what you like to disguise as. Another thing i would like to adress, is that you keep the disguise that you get bumped into in, if you are seen, or even if you aren't its probably a good idea to put on another disguise before jumping in, then switching once you get ready to uncloak. If you watch one of my demo's i do this a lot, or at least try to. ( on a side note, please watch my demo's =P ). Other than that good job.
3) movement. You did good here, very good, you avoided bullets, and people to the best of your abilities, especially sense I'm pretty sure it was a 32 man instant respawn server. On a side note, try to stick with 24 man pubs, you'll do better.
4) opportunity's. This is the real deal here. you do well overall as spy, and you got your stabs down, you know a good amount of basics and the such, but this is a biggy. You close off opportunity's to yourself, mainly by cloaking to much, in unneeded places, and by avoiding fights where you would have had a 95 % chance of winning. An example is when near the end, you walked into the balcony cloaked, to see an enemy spy ( disguised as a soldy, but it was obvious. ) instead of avoiding him, you could have easily cornered and killed him. There were several of these in here, and i would recommend being just a tad bit more offensive, and make sure that you take an easy kill when you can.
5) Revolver. This is another big one. You obviously weren't afraid of using it, however you seemed to be a little too wary of it. There were a lot of great opportunity's for the revolver ( the two tie in ) that you seemed to scared to take. This is a very underestimated weapon, not only by your enemies, but by yourself as well.
6) fight or flight. This is another one, not so big, and you didn't do bad at, but something to keep in mind. Sometimes you need to fight, sometimes you need to escape, you seem to be okay at telling which is which, but you made mistakes.
7) the last one. CHECK AROUND YOU MORE. You check around yourself a bit, and you do it okay, but there are several points where you could have simply checked your six when you were walking. now it didn't make too much a difference this round, but you definitely should keep that in your head while playing.
Some of these i have trouble with myself, some i don't, some i don't even want to think about. Your spying is a bit different than mine, however i must say, i don't think that you are a bad spy at all, your pretty good, just need to spruce up a bit. Hopefully you'll be a pro in no time. ( by no time i mean a couple hundred hours
) the rest is just practice.
On a side note i LOL'd HARD when i saw the part around fifteen minutes, where the sniper exited the spawn, and was standing there, and you tried to stab him but he zoomed ahead. That almost made me cry.
OVERALL: one last thing. you did well, very well, and i think your a pretty good spy. Got some things to work on but we all do, most of all, you should understand that a big part of spy is luck. Its a weird luck, that varies from game to game, and with your skills as spy, you should be able to make other people's luck very very bad, but its still luck. Your a good spy, and with a lot more practice we both will be able to frag like the gman's of today.