What do you think about meal replacement shakes

One week is too soon to know. Are you logging your calories and exercise? because that's the only way you're going to be able to tell if you're in the weight loss zone.

As for your title question, I don't care for meal replacement drinks myself, personal preference... I'd rather eat the meal. However, for some people it works fine, especially those in a hurry or who want a simplified meal or those who tend not to eat enough at a meal.

i think i like to eat my food and not drink it.

one week is too soon to judge any weight loss.

I don't see any issue with drinking a shake for breakfast..some people don't even eat breakfast at all. "Nearly a week" sounds like it hasn't even been a week yet...you don't just start losing immediately just because you're in a calorie deficit (assuming you are). Weight loss doesn't work that way. It can take as long as 3 to 4 weeks sometimes for anything to show up on the scale. Not always, but my main point is that you're going to need some patience.
Also, if you're not trying to lose a lot, then your calorie deficit should be very small (set to .5 lb a week) and you'll need to be very precise with your intake. If you want to replace a meal or two with shakes, that's your call..for me personally, that was a miserable experience when I tried it.

It depends. I use plant protein and meal replacement but also alternate. I also make " green drinks" that have leafy greens, avocado, almond milk, pea protein, chia and other things
You can try that too. I feel like they can be very beneficial if it is part of a lifestyle change. If you are using them to accent a new way of eating thats great. If they help you fill in gaps, stop eating fast food or other foods you choose to avoid or stop cravings then awesome. It's probably a good idea to remind yourself that the calories matter all around. Some people go on plans with shakes and bars, loose weight then go back to what they were doing prior to losong weight just to regain. That I'd why weight loss products is a huge Market.
I work in fitness and a health food supplement retail store. I get asked ALL THE TIME about weight loss. They want a pill, shake or simple way out. I am honest, tell them nothing I sell them will be the cure unless they change thier eating. I also them about MFP!
I use Sunwatrrior Lean Meal and Sunwarrior protein powder. They are like a treat and help when I come home late. I may have it at work or in morning. It depends. But they fit into my lifestyle.

I don't use the ready-made meal replacement shakes (just too expensive and tastes IMO) but I occasionally make up a yogurt lassi as a light meal on the run.
Works well for me.

Not a fan because I want the experiences of eating/tasting/savoring food and feeling full/sated. Volume eating mutitudinous veggies does me much better than a shake.

I have tried shakes of one type of another for periods for much of my life - I remember the first ones coming available more than 50 yrs ago, and my Mom jumped on the bandwagon. Never had much results for weight loss. However, they have had some benefits for a quick meal replacement - for just that purpose: circumstantial. Every once in a while I try them again, but my focus now is evolving towards supplementation, not replacement (i.e., Ensure-type benefits).

With the first wave of covid lockdowns last year, and the disruptions in supply chains, I decided to lay in a quantity of the SOYLENT meal replacement. Plain flavor. I found it to be reasonably palatable (nothing objectionable), reasonably satisfying, and reasonably nutritious. In other words, just OK. For me, the experiment didn't need to go beyond two months, and by then, groceries were more easily available again. Now, I did lose a few pounds using the shakes as a lunch and about 50% breakfast-lunch replacement (never dinner or all-day meal plan), but I am not entirely sure that was due to the shakes or just the radical shift in dietary intake as a result of the lockdowns.

My takeaway is this: I use various powders, plain unflavored whey and nutritional yeast mostly, as purpose-based supplements to normal food, and regulate my normal food diet for weight loss using a modified intake. In the 2 yrs pre-covid, I dropped 85lbs with this approach, combined with cycling and swimming, or gym work in the winter. I don't look to commerical meal replacements for anything other than occasional convenience. I keep a box in the pantry just for this.