Yeah, I think Poison is a really good character and very likely top 10. Love me tender is such a good move as it's usually only 0 on block at the worst, goes over fireballs and lows, catches airborne opponents and breaks armor. I may pick her up soon just to mess around with.
Love Me Tender being able to get the throw follow-up on airborne opponents is so good, you get at least 190 damage every time. Also let's you get good damage even when you backdash after landing Lv2+ Focus. I see a lot of Poisons go for the throw follow-up instead of doing a combo on grounded opponents though. Especially in the case of an armor break, where Poison is at least +7 and you can go straight into a heavy attack, it's better to go for a regular combo than to lose damage and stun with the throw.
Love Me Tender also goes over a lot more than just lows, it can go over Ken's F+MK, Balrog's Dash Straight and Rose's Soul Spiral, to name a few. If you're not using high-position standing attacks, anti-air normals, or an invincible attack, it will probably go over whatever you're throwing out. Normal Tender also reaches to the ground, so I like throwing it out an L or M Tender to catch slides too occasionally.
EX Tender can be pretty silly, cause it's a great move whether it hits (projectile invincible, 200 damage) or whether it gets blocked (at least +2). I also like doing EX Whip of Love, EX Tender for a stylish finish (it's also her highest damage EX Tender follow-up, not counting UC1).
Though one thing, normally Tender is -1 on block, still very nice.
No one special should have all that power
Going over fireballs with normal Tender is normally a predictive thing, unless you're doing it at far range to get over fireballs to close distance (though that can potentially be risky). Some fireballs are harder to get over than others, but overall it still works well if you have a good read.