Alright cut, but nothing I haven't heard before.
BASS: It's not a traditional walking bass line, and for most of the song, that's alright. But the problem is that since you aren't using a real bassist (or it doesn't sound like you are), it just repeats on and on and on. Your bass line earns a 6/10 for being unique, but would've gotten higher if it didn't repeat.
DRUMS: Again, a synth instrument on a loop. Since it isn't a standard jazz beat, that earns points, but since it never switches, it sticks out like a sore thumb AND doesn't change at all. Oh, wait, at 01:20, the drums cut out. YES, CHANGE. Sixteen seconds later, they're back in, unchanging as ever. 5/10, higher if it would've not repeated for the length of the track.
HORNS: This where you get your big downfall. The initial sax entrance is great. Then, forty-five seconds later, it repeats. Also, at 00:16, the backup horns come in nicely, with 1 + 2 +a3 +a4e. Guess what I get to hear for the next ninety seconds, forever unchanging? Yep. 1 + 2 +a3 +a4e. At 01:04, the tenor sax comes in. THANK YOU, WINDS OF CHANGE! Oh. Wait. It's just repeating itself.
What's this Alto garbage at 01:42? It comes in on an offbeat, and plays a lick three times over that really shouldn't be played, ever. Then a horridly high note, and a soothing jazz scale down. OH GOD, PLEASE, NOT A REPEAT!!! ....fuck.
At 02:16, thank god, a somewhat good sax sound. And not a repeat, nice, though you already used it.
At 02:40, finally, a really good idea that I've been waiting for for 160 seconds. Why'd you make me wait for layering? Also, please don't repeat that.... damn it.
Finally, the fade out. Good, time to give my ears a rest.
FINAL THOUGHTS: Basically, what you did here is make a vamp. Now, ideally, if you were playing all of these instruments and tracking separately (which would be quite sweet), you would lay your drums down, and then you'd spend a time making a bass line that didn't suck. Did your initial bass line suck? Hell no, it wasn't half bad, but the repetition killed it. You gotta make sme variety happen. On everything. On horns, my god, the Alto solo was HORRID at 01:42. You need to focus on rhythm in a vamp, sure, but notes wouldn't hurt either.
Is this a bad track?
It isn't the worst.
But you've got some studying to do, I'd imagine.
Keep at it, though. Even if this is all synth, you could've made this better and more interesting.