Þau streyma miðlungs þáttaröð, en ég fylgist samt með.

Þau is a third-person plural pronoun, but it is not the same as þeir or þær.

It is commonly used for:

• a mixed-gender group of people
• children
• neuter plural nouns

So if the speaker means they in a general or mixed-group sense, þau is perfectly normal.

Yes. In modern Icelandic, að streyma can be used for digital streaming, just like English to stream.

So Þau streyma ... can mean:

• They stream ...
• They are streaming ...

Icelandic does not have a separate continuous form like English are streaming, so the plain present tense can cover both meanings depending on context.

Icelandic has no indefinite article. There is no separate word equivalent to English a/an.

So:

• þáttaröð = a TV series / series
• þáttaröðin = the TV series / the series

That means miðlungs þáttaröð naturally corresponds to a mediocre TV series.

Þáttaröð is a compound noun:

• þáttur = episode, part, segment
• röð = row, sequence, series

Together, þáttaröð means a TV series or series of episodes.

It is also useful to know that þáttaröð is feminine, which matters later if you refer back to it with a pronoun.

Miðlungs means something like:

• middling
• average
• so-so
• mediocre

In usage like this, it often behaves as an indeclinable modifier, so you do not see the usual adjective endings that many Icelandic adjectives take.

That is why you get miðlungs þáttaröð, not a heavily inflected adjective form.

Because fylgjast með is a different expression from fylgja.

• fylgja usually means accompany, go with, or follow physically
• fylgjast með means follow, keep track of, watch, or pay attention to

So in this sentence, the speaker is not saying I accompany it or I physically follow it. They mean I still follow it / keep up with it / watch it.

Ég fylgist is the first-person singular present of að fylgjast.

Because fylgjast með is a fixed verb + preposition combination.

This is similar to English expressions like:

• keep up with
• check in on
• go along with

In Icelandic, the með can stay later in the clause, especially if the object is omitted or comes after it.

So:

• Ég fylgist samt með. = I still follow along / I still keep up with it.
• Ég fylgist samt með henni. = I still follow it.

Yes. The object can be omitted when it is obvious from context.

Here, the listener already knows the speaker is talking about the þáttaröð from the first clause, so Icelandic can simply say:

• ég fylgist samt með

If you wanted to spell it out, you could say:

• Ég fylgist samt með henni.

Because þáttaröð is feminine, the pronoun is henni.
Also, fylgjast með takes the dative, which is why the pronoun is henni, not hana.

Samt means something like:

• still
• nevertheless
• all the same
• anyway

In this sentence, it shows contrast:

The series is only mediocre, but the speaker still follows it.

So samt is doing an important discourse job: it makes the second clause sound concessive.

Because Icelandic normally follows a verb-second pattern in main clauses.

In a simple clause like this, a very normal order is:

• subject
• finite verb
• adverb
• rest of clause

So:

• ég fylgist samt með

is the expected pattern.

If you moved samt to the front for emphasis, then the verb would still need to stay in second position:

• En samt fylgist ég með.

That verb-second rule is one of the most important word-order patterns in Icelandic.