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To put it bluntly, you are playing to the weaknesses of your army rather than your strengths. Tau and IG are SPECIALIZED in shooting. Rather than ineffectually trying to hold off superior weight and quality of fire, you should be focused on eliminating sources of fire by assaulting units and blocking LOS. You want Hormagaunts, Winged Tyrants with implant attack, and Raveners. These units should never fail to catch pesky speedy things like Tau Crisis Suits and fast moving light tanks. Their sheer speed also means you'll be in CC quick, where Tau and Imperial Guard hate to be.

As a side note, it's only your first few games; expect to lose. It took me a few months of playing before I picked up the basics of using my own army and finally started winning.

While the part about the barbed strangler ripping up guard is true, the hitting on 2's isn't. Giving a strangler to a Carnifex means it gets one chance to hit on a 5+, or 4 with senses.

yea, my bad.

i meant wounds

Biovores are pretty unimpressive. Carnifexes give you better Anti-tank and better survivablity. Broodlords, likewise are not all that impressive. They have some really impressive assault stats, but are hard to get into combat. Infiltrate helps, but the BL will never catch anything that moves faster than 6" a turn, so if you use him, plan your Infiltration spot carefully. Most players I know prefer Hive Tyrants, as they're much simpler to use and provide a little more utility.

Also, never Deep Strike Raveners unless you're forced to. They have an assault range of 19" to 24", and if you have them on the table from Turn 1, they should have an almost guaranteed Turn 2 assault. Deepstriking however, means they come on at Turn 2 at the soonest, then are stuck wherever they are for a turn, and only then get to make thier move. Even if you walk them on from Reserve, at least then they have a chance to assault.

Thanks again, I was skeptical to put them in there, but yeah. Designing my new army now! xd

Hey, guys. I'm designing my army, and I was wondering if this sounds good:

Hive Tyrant = HQ Bios : Acid Maw, Enhanced Senses, Adrenal Glands (+1 WS), and Rippers. Weapons : Lashwhip/Bonesword, and a Twin Linked Deathspitter. And two Shielders.

Tyranid Warriors = 6 Elites Bios : Rippers, Adrenal Glands (WS), and Extended Carapace. Weapons : Devourers and Scything Talons. 1 Has Venom Cannon instead of Devourer.

Genestealers = 12 Infantry x 2 Bio/Weapons : Scything Talons, Toxin Sacs.

Hormagaunts = 25 Infantry Bios : Toxin Sacs, Adrenal Glands (WS).

Spinegaunts = 10 Infantry Weapons : Spinefists.

Carnifex = 1 Heavy Support Bios : Regenerate, Macetail, Thornback, Tusked. Weapons : Barbed Strangler, Lash whips.

You definately want to tack on the points value for the entire list; Not sure how big this army is without it, or without referencing Armybuilder or the 'nid Codex, which would be a pain in the butt. Points values for individual units are alright too, but don't put up how much each upgrade costs.

As for the list itself....
HQ: Drop Acid Maw. Implant attack is the best Tyranid mouth attack, buy it, use it, and laugh as 4 wound characters fail two saves and die. Might want to drop the Bonesword/Lashwhip. The Bonesword is more useful if your Tyrant is herding gaunts, but since he's a footslogger, the gaunts are going to outrun him and escape the effects of Catalyst. Either drop the Guard and make him fly, or drop the Bonesword/Lashwhip for a Venom Cannon or Barbed Strangler.

Elites: Pretty standard Warrior squad here. Problem is these guys are footsloggers too. Either your Tyrant or your Warriors (but not both) NEED to be Winged. Otherwise your Gaunts and Hormagaunts will outrun Synapse, lose an assault, and be run down. You need some fast Synapse to keep up with the Gaunts.

Troops: Genestealers need Extended Carpace, otherwise a simple Bolter volley will annihilate your CC-deathmachines. Toxin Sacs are generally unnesscessary unless you plan to be going after vehicles. Hormagaunt squad is huge. Might want to drop the Spinegaunts and split the hormas into two squads.

Heavy: No offense, but I have a great dislike of this carnifex you've built. It's like he's not sure what he's supposed to do. If he's going to be a shooter with that Strangler, he NEEDS Enhanced Senses. Macetail and Thornback are unnesscessary, but keep them if you really wish. Drop the Lashwhips. If you really want a hybrid shooty-assaulty Carnifex, give him Crushing Claws to go with his gun.

Overall, the list is kinda themeless. You've got a little of everything, but it doesn't mesh together very well. You haven't got any real ability to deal with tanks, and the abilities of your various units aren't synergistic. I highly suggest getting a Sniper-fex (E. Senses, VC, BS) to deal with tanks, as that's what's going to tear this list apart.