Why not have my crock pot roast beef flavor of any meat?

I followed a recipe to make a great roast in a crock However, when it was made meat was very bland. no taste at all sectors of the meat. I added some spices and has e rubbed on the meat the night before. A thenig I did this was not in the recipe was to brown the meat before placing in slow cooker. apples Potatoes and other vegetables picked a taste for seasoning and liquids that I put in. Need help getting to the meat taste better.

DONT Brown meat, cook for ingredients that together so that the flavors blend, also use an injector to inject the flavor and seasoning under the skin or outer layer of the meat … If you do not have a flavor injector, then do a little clean cut in the top layer of skin or meat and seasoning rub there and also add a little liquid cooks everything in. ..

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