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так себе stresses
gen.	la la; not much cop (Anglophile); not up to par (Ремедиос_П); tol lol; not much (scherfas); tol-lol; so; subpar (Taras); so-so; fair to middling; so-and-so; nothing out of the common; no great things; so and so; so so; indifferently well; of a sort; of sorts; nothing to shout about (Anglophile); spotty (Her English is spotty. joyand); of a kind; plain vanilla (VLZ_58); no screaming hell (Taras); no hell (Taras); so, so; middling; nohow
Gruzovik	just passable
Игорь Миг	not-so-great; not that impressive; less-than-stellar
amer.	not much to look at (The ​house isn't much to look at but it's ​spacious. Val_Ships); not so hot; ho hum (о положении дел, состоянии Tamerlane); it's nothing to write home about (Val_Ships); no biggie (this show is no biggie Val_Ships)
austral., slang	not much chop; not too hot
brit.	damp squib (slitely_mad)
context.	run-of-the-mill (VLZ_58)
inf.	not too good, not too bad (–Как ты? –Так себе. – "How are you?" "Not too good, not too bad." themoscowtimes.com); not exactly (Abysslooker); meh (используется для уклонения от ответа на вопрос alia20); nothing to write home about; it's not much of something (Abysslooker); about six and six (в ответ на "как дела" 13.05); patchy ("What was the performance like?" "Patchy" – "Ну как представление?" – "Кое что можно посмотреть, но в общем так себе" VLZ_58); no great shakes (VLZ_58); not much of a (I'm not much of a singer); pedestrian (Earl de Galantha)
proverb	not up to much
rhetor.	mediocre (неважный, не ахти какой Alex_Odeychuk)
slang	fair to middling; cruddy (that's a cruddy outcome SirReal)
uncom.	la-la
Игорь Миг, inf.	not too bad; nothing to shout about; just middling; nothing great
так себе!
gen.	not too good! (kee46)

так себе: 224 phrases in 16 subjects

Chess	1
Derogatory	1
General	121
Idiomatic	1
Informal	8
Literature	1
Makarov	79
Mechanic engineering	1
Music	1
Pejorative	1
Programming	3
Proverb	1
Quotes and aphorisms	1
Religion	1
Slang	2
Vulgar	1