I'm not sure if this is a mistake... but it's showing you're wearing a lv37 leather wrists???? May want to update those to plate wrists asap.
I see you're wearing a lot of blues... maybe more than me lol. Some of the level 40 and below blues you may want to see if there's any greens to replace them. You maybe losing on Defense and +Stam/Agi/Str by keeping those. They are after all 10 levels old and counting.
Keep your gear as current as possible IMO. Pre-Outland is fairly easy, your tanking is pretty much your DPS gear. As you noticed we're very gear dependant.
I see by your skills you're pretty current with 1st aid... but no cooking? You'll end up regretting that in Outland. You'll miss out on some easy +20Str/Spr foods, and the +20Stam/Spi food when tanking. Being a Gnome you need it more than I do lol, but I'll still eat when running instances. You may want to look into cooking (Here's a tip: Sliced Bread will get you up to 32-35 ish, and it's cheap to make).
Nice Weapon. Wow! Talents are nice. Just armor (current) and cooking (if you want) and you'll have no problem. Just take your time. Hit Winterspring when you can (I prefer that place over stupid Plaguelands anyday), and Slithis I totally skipped.. I hate fighting those bug mobs, it's too packed with mobs and roaming mobs and elites... Skip if you know what's good for ye
*Off topic* How is leveling a Gnome Warrior? I got a lv10 one, that I've been dragging my feet on... it's one hell of a long leveling grind.