Not another LV.X ._.
1. How does the card stand on its own? Is it good, bad, or have potential? Is it worth being played?
On its own, the card is a serious headache for your opponents. 110 HP is average for an SP LV.X, and Jet Shoot is an incredible amount of damage for just 1 {R} Energy with E-Gain. Unfortunately the drawback makes it unwise to repeatedly use it. The X2 Weakness to Water is a pain, but not unreasonable. But its Retreat Cost is crazy. Free Retreat would make much more sense here. Burning Spirit doesn't do anything without support or Blaziken FB. A good, quick card to spring on you unexpecting opponents and make a quick 80, but not built for constantly damaging.
2. What popular metagame decks is it used in?
SP's, really. Notably Blazeray and Blazechomp.
3. What combos can you use it with? How so?
Anything that burns could help pile on 40 more damage. Heatran X would make a max of 160 damage for a single Energy, not counting weakness. Cherrim SF would make it do even more damage and Cherrim AR would help it take hits better.
4. Give it a rating, and explain why you have given it that rating. You can also rate the card by rating the thread itself (out of 5 stars).
4/5. Quick, cheap Energy cost, and can do 100 for 1 without any support needed. Unfortunately its rather frail and Gyarados laughs in its face.
5. How's the artwork?
4/5. Really looks like its ready to leap out of the card and give you a roundhouse kick, but seems a tad too...what's the word...Kung-Fu-ish?