I'm not even going to dignify the first (#58) Lantern with a full review. 1/10 all round except in Limited (7/10 for being playable and not completely sucking here). No reason to use him at all in Modified or Unlimited, poor attacks that cost too much for their damage and benefits, bad Weakness, etc. Mediocre in every aspect.
Now, Lantern #59 is much better. 90 HP is solid for a Stage 1, +20 Weakness to Fighting is fine since it's not too commonly played, no Resistance is common, and 2 Energy for a Retreat Cost is a tad expensive. Energy Split is a very effective spread attack, hitting any of your opponent's Pokemon that have any energies attached for 30, all for 1 Lightning Energy. Aqua Bolt isn't an attack you'll likely use, but it does deal a decent 60 for 1 Lightning and 2 Colorless, plus 10 more for each Water Energy attacked. This is used in conjunction with Tentacruel, who latches on Energy to the opponent's benched Pokemon with his free attack (which also damages them), setting up Lanturn perfectly.
Modified - 7.5/10 (Solid card in a rather unique deck made for it and Tentacruel)
Limited - 7/10 (Solid here as well, Energy Split should be very effective and you can power up Aqua Bolt to deal more damage if you run some Water Energy)
Unlimited - 1/10 (Nothing saves it from being 1/10 here though, no use)