Just because you think cards in the set aren't good doesn't mean that the set is bad.
indeed While some of the cards in the set (made of 70 or so cards mind ) you may not have a lot of game changing or game defining cards
does not mean it's a bad set.
more or less Also some of the cards you've criticized are for reasons that I find unsatisfactory, and as such here as some counter arguments to some of them.
Emploleon: yes it's weak to Electric, but it can also be played alongside counters, such as Donphan for it's poorer match-ups as it requires only one energy and still has a useful ability.
everytime they send up a zekrokm you send up donphan (you have to pay 2 energy, and your attack takes one), and everytime you send up donphan they send up tornadus (costs them two energies which they get back via eelectric). Once they send up tornadus you qq a bit and lose. And remember these are basic pokemon.
Espeon: Depending on how the format turns out it can make a nice simple counter against otherwise destructive decks, and is not meant to be used against regular decks that would use it for easy kills.
That argument can be applied to any card, 'depending on the format'.
Aerodactyl: A consistent Plus Power seems rather impressive to me when that could easily snag an OHKO against several Pokemon, and if a way to get it out consistently is made then it's well worth it IMO. (Also even if they kill it then you can Twist Mountain it back into play)
A harder to get out kingdra prime that has less hp and a far worse attack?
Zorua/Zoroark: You underestimate these guys, a :dark: deck could put it to good use, and Ascension may be a game changer for Zoroark, both new and old, as don't the BW one can use EX attacks at a cheaper cost both in terms of energy and prizes.
That doesnt change the fact that these cards are not played, and if they aren't played than you can't use the zorua. Out of these cards this one see's the most viability (other than dark claw which I already said would be an awesome card)
Dark Patch: Then I guess the hype of Eelecktrik is wrong then.
uhhhhh. eelectric is good because you get an energy EVERY TURN, and it uses a type that doesn't suck immensely (at the moment).
Dark Claw: Dark Patch plus Pokemon like Tyranitar, and Zoroark? Those can safely OHKO an EX with a Plus Power or special :dark: energy.
Yeah this is pretty cool
Twist Mountain: Useful for more stable Archeops builds, and for Aerodactyls (who can easily come back if KO'd thanks to said stadium)
Archeops is the only good fossil, and it takes 2 turns, assuming you get the first heads, and if you don't you may meet your friend tropical beach or another stadium. As well as the fact that archen is catcher bait and archeops to for that matter, it has 2 retreat.
Are they perfect? No, but they aren't horrible. This set has primarily support instead of big bad attackers like previous sets have, which isn't a bad thing IMO.