Off the top of my head:
-Doom: I'm really mixed about the Doom games. I think D1 and D3 are solid games, yet D2 and D4...aren't. Which is weird, I know, since D2 is arguably more of the same, but, yeah. It also irks me that the series has had two reboots, one of which ensures that certain plot points in the D3 setting will never be addressed, and is given a free pass for that. It also doesn't help that I feel Doom popularized what I call "the John Carmack School of Thought" when it comes to story in games, and overshadows Marathon, which was released a year after the first Doom game, which showed that you didn't have to sacrifice story for gameplay, even if Doom is more enjoyable at the end of the day. It's not so much that Doom doesn't have much of a story that bothers me, it's more that it's to the extent of being anti-story. Even in multiplayer-only games, I still value context behind the actions/setting (e.g. Overwatch and various MOBAs).
But, "enjoyable" is the key word. Doom is enjoyable. D1 is enjoyable, D3 is very enjoyable, D4 manages to be enjoyable about 50% of the time. But it's a case where there's a series where I can only claim to have enjoyed half of the installments I've played.
-Diablo: It's not so much the games, but it's the fanbase that really aggravates me at times. I mean, okay, fanbases can be cantakarous by their nature, but Jesus Christ, after the shitstorm that erupted after D3's initial release, you'd think the developers drowned an entire civilization's worth of kittens, and then set puppies on fire for the hell of it. And, okay, I know I'm like the only person on the planet who doesn't like Diablo II, and whose level of preference goes D3>D1>D2, but some of the fanbase's complaints and mind games/self-justifications make me go "...huh?"
So, yes, I enjoy Diablo overall, but I'm very much on the fringe of what its core fanbase desires, and that can't help but colour my enjoyment of it.
-Half-Life: Only played Half-Life 2 and its episodes. It's...fine, it's average, it's enjoyable, I'd like to see Half-Life 3, but I could die happy without it ever happening. Just the usual feeling of liking something, but not as many as others like it, so that can generate negative thoughts at times.
-Metroid: This isn't really a love-hate thing, but only from the feeling of only enjoying the 2D games but not the 3D ones, of Fusion being my favorite, of not finding Other M that bad (least from watching a playthrough), etc. It's more the sense of enjoying the Metroid series for what it is, but being invested in things within it that most of the fanbase isn't (e.g. story, characterization, etc., before isolation, exploration, etc.)
-Star Fox: Mainly because Zero has rebooted the series AGAIN, because Command was so lacklustre, and so far, nothing has surpassed Star Fox 64. I guess I like the series, but it often feels like it's living a life of anti-climax.