These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Under Siege
Best Known For The Fanservice: Quite literally in this case. The scene where Erika Eleniak pops out of a giant cake while topless is one of the most-remembered scenes from this film.
Complete Monster: More or less lampshaded by Strannix when Krill decides to drown most of the ship's crew in order to bain Ryback into killing himself trying to save them.
The villains in 2 are even worse; they are plotting the deaths of 8 million people for profit. Several of them are also clearly sadists.
Crowning Moment of Awesome: Many of Casey Ryback's improvised actions count as these, including but not limited to blowing up a Chinook using paint thinner and blowing up the submarine with a little help from his friends. Also Ryback kissing Jordan when he's asked to "show us some moves" by his crew.
Crowning Moment of Funny: Krill in a dress and makeup, asking Strannix if he needs psychological help, to which Strannix shakes his head.
And in the second film, Travis Dane using the backdrop of the Eiffel Tower for his threat video.
Crowning Moment of Heartwarming: Ryback working with his mates, and their sadness over the deaths of some of their number. Also Ryback's Due to the Dead moment, taking a few moments to cover the captain's body in a show of respect to his murdered friend even with the situation around him still dire.
God-Mode Sue: At no point does it ever look like Ryback is in trouble.
And yet it's still remarkably subdued compared to Seagal's usual characters - Ryback is far less respected than the standard Seagal protagonist, for starters.
Also, the hostages are supporting cast are usually in a lot more danger, so the movies still manage to have some tension.
The Scrappy: Invoked, for humour. That one annoying balding guy in the glasses working for the Pentagon in the sequel. When he makes a lame quip about space being called space because there's so much of it, an admiral tells him never to speak again.
Tear Jerker: Ryback draping the dead Captain's uniform over his body, after Ryback finds the captain killed in cold blood.