I am looking for homologous genes in various protozoan species using BLAST. The genome sequences of these species are deposited in NCBI's WGS database. NCBI’s webpage includes the global statistics for each WGS project and it indicates the assembly level (scaffold, contig, etc.), the assembly statistics (number of contigs, N50, L50, etc) and (if available) the genome coverage. Can any / some of these parameters be used to evaluate the genome assembly’s "quality", especially if there is more than one genome assembly for the same species? Can these data be used to determine if the genome is very fragmented or not?
I understand that quality is a relative term and that there are several options for assessing genome assemblies (QUAST, BUSCO, etc.) but I am just looking for a "simple" way to compare several genome assemblies (for e.g., this post How can I improve a long-read assembly with a repetitive genome? states that the reference genome is highly fragmented, but there is no explanation regarding how the OP determined this). I believe that the N50 value can be helpful, but I need some context to understand what is "good" or "bad". I am at a loss of where to start, so any information will be greatly appreciated!